Gaster is able to retrigger all Synergy effects you successfully triggered this game. Synergy is an effect also added in Beta 46.0 and became the replacement of Future for his Followers, making Gaster the Ace of a Deck featuring them, similar to how Muffet became the Ace of the also new Arachnid Tribe. However, unlike her, Gaster isn't a Follower himself.
- Dark Darker (by Moonlightring)
- Very Interesting (by Darky)
- Glitched Gaster (by CoreSilence)
- During testing, Gaster didn't have Haste as it was meant to actually be obtained from Redacted. But this didn't work properly, and it was decided to give him Haste by default.