Galahad is commonly the front-man for a Grail Ice Suite. It is cheap to rez at only 2 and most players face-check using a sentry breaker and may not be prepared to get damaged by a barrier.

Galahad can support or be supported by Lancelot for program desctruction and/or Merlin for net damage and a potential flatline. Another less likely possiblity is Excalibur which may or may not be relevant depending on which server you have located your Ice on. Often central servers get run 1st in multi-run turns, either to deactivate Jinteki: Replicating Perfection, build up Datasucker tokens, during a multiple-run Medium dig or sometimes during a Account Siphon/Vamp and then run unrezzed Ice play. Defending a scoring server with Ash 2X3ZB9CY, Caprice Nisei, Red Herrings, a Nisei MK II agenda token or even Marcus Batty becomes much more effective when it is their own run that turn.

Grail Ice will take up a big chunk of influence in whatever deck it's played in. Decks that synergise such as The Foundry: Refining the Process or possibly NEXT Design: Guarding the Net can support grail Ice and The Foundry in particular is very synergistic since it lets you pull additional Grail Ice to your hand.

In general grail Ice is not particularly good because of the following drawbacks:

1. Moderately high rez-to-strength ratio
2. Influence hungry neutral cards (except for Excalibur)
3. Require additonal Ice to sit in the hand until the runner runs on a server containing rezable Grail Ice. The additional cards clog up the hand and compete for slots with Agendas, Operations and even installables that are not quite ready to hit the table.
4. The Corp has limited deckslots for Ice and usually needs to defend several servers including Centrals, the scoring server and possibly Asset economy, Ice that stays in the hand may become a temporary or permanent 'dead draw', especially if the runner is not running the relevant servers.

Potential Combos:

TL;DR to double the number of subroutines. Since they are both 'when' constant abilties you should be able to trigger them in the order of your choice.

Marcus Batty to try and trigger one of the gained subroutines.

Mumbad City Grid to keep adding additional subroutines.

This card can give you incredible mileage in Jinteki: Replicating Perfection or Industrial Genomics: Growing Solutions.

Firstly it lets you stack advancement tokens, this means it can be a target for Space Camp and Trick of Light. Inside Weyland it can also benefit from Shipment from Kaguya, Hollywood Renovation or any of the other cheesy Weyland cards that allow/help you advance Ice.

Secondly it lets you use any subroutine, this is great because some of the best ice for these Jinteki decks are Excalibur or Susanoo-No-Mikoto which are both Uniques. Furthermore it can be used to fire net damage subroutines such as Neural Katana or trash a program routines from other Ice like Ichi 1.0, Grim or Swordsman. It also fills in a big gap in Jinteki ice - it can also let you end the run. Remember Wormhole lets you fire off strong subroutines that have the misfortune of sitting on low strength Ice or Ice that don't often get encountered, so don't forget Architect or Crick. An even weirder possibility is to use it to trash hardware by combining it with Taurus or using it to 'refire' failed traps like Whirlpool.

Another benefit of this ice compared to staples such as Komainu is that it is not vulnerable to Parasite.

Strengths: With a full 3 advancement tokens on it (or even just 2) it is not particularly vulnerable to derez abilities such as Emergency Shutdown or Crescentus. Since the surprise factor will likely be low in any case you could also rez it early with Executive Boot Camp against DDoS/Blackmail style decks. It will cost Cyber-Cypher 4 to break, Gordian Blade or Eater 6 to break and Faust a whopping 4 cards as well. It will also stop Endless Hunger in its tracks, since it is not an ETR subroutine... even though you can use it to ETR. For added hilarity you can even land some borrowed brain damage from a lowly Viktor 1.0

Weaknesses: Wormhole can be a Femme Fatale target, it can be broken for 1 counter with D4v1d and it can also be broken with Knight. Once you advance it, it will also be the first piece of ice that gets bounced by Leela Patel: Trained Pragmatist's ability.

The cost could also be considered a weakness, since it costs a combination of 9 or 3 advancement tokens to rez it. It's worth noting that it loses one of the big benefits of Ice by telegraphing itself as an advancable, although it can make up for it in flexibility.

Lastly Wormhole is completely worthless if you don't have any other Ice rezzed, so you will need to support it by playing other Ice with useful subroutines.

Janky Combos: I don't recommend trying for this sort of thing but you could try and combine it with Inazuma, Sensei, Marker, TL;DR, Flare, Shinobi, Bullfrog or even Cell Portal. Marcus Batty is a more reasonable and realistically landable combo which can potentially do some damage as well.

Reuse is a very limited card, but there is one deck that can make use of it in the normal course of play: Industrial Genomics: Growing Solutions

Instead of needing to draw up above 5 in order to shed a few cards, you can spend 2 to fill your archives with face-down cards and gain s at the same time. This can be a great way to recover from getting Account Siphoned or Vamped or even needing to rez a lot of ice or assets (such as Hostile Infrastructure) during the previous turn. It is also useful just to 'reload' archives if the runner has just accessed them the previous turn as well. Lastly it can be a powerful response to Fisk Investment Seminar.

Now in a lot of ways this card could be compared unfavourably with Celebrity Gift, which is in faction and doesn't involve discarding cards but lets make a direct comparison here:

Reuse has a cost of 0 vs Celebrity Gift's cost of 3

On a hand of 5 cards + 1 mandatory draw Reuse will gain a maximum of 10 and Celebrity Gift will gain a maximum of 7 - as the number of cards in hand decreases Reuse becomes more efficient than Celebrity Gift. As the number of cards in hand go above 5 Reuse is also potentially even more profitable

Both Reuse and Celebrity Gift are double type operations and cost 2

Celebrity Gift gives away information which can be very double sided for Jinteki, intimidation and mind games is a potential benefit, giving away warnings to your opponent regarding your potential traps and tricks (as well as the presence of Agendas) may be a disadvantage.

Reuse costs you cards, which represent a each to draw (or replace, after you trash them with this ability) so mechanically it gets you 2 per . Under ordinary circumstances this is not an acceptable return from a card that costs a to draw and 2s to play. This is why you can only make good use of it in Industrial Genomics Decks, where you want to trash cards anyway and it can potentially make what is normally an inefficient set of actions (drawing just to discard into archives) into a profitable bonus.

Support cards and potential janky combos? In Industrial Genomics you will want to run Jackson Howard, Crick and Museum of History anyway to enable long term use of your Id ability. Other potential recursion cards such as Allele Repression, Archived Memories, Architect, Team Sponsorship or even Reclamation Order are possible too. The only other potential use for this card is in Cerebral Imaging: Infinite Frontiers as a way of making a lot of s very quickly (maybe after getting vamped for everything the previous turn or to fund a mega Midseason Replacements (but that will use up 3s).

Alternative cards for Industrial Genenomics include: Heritage Committee, Green Level Clearance or Blue Level Clearance which package draw with some additional benefit.