Large numbers of small creatures with a self-destruct mechanic would be their core gameplay gimmick, but maybe they could also be the setting's obligatory "tinkers," possibly using their own acid as fuel for all manner of weapons and war machines
Faramir, Steward of Gondor and Commander Sofia Daguerre have triggered abilities that you'll be happy to have more of
Neyali, Suns' Vanguard If you want to get some more card advantage in your token decks, Neyali, Suns' Vanguard happily paves the way for you
Four life per connection which can be as much as 8 life per turn with re-equips for blocks or double strikers is a fair old chunk
My Wife, Daughter & I have been going crazy with MTG, Yugioh, Lorcana & Pokmon
Within those sets of inks are cards that are catered to specific play styles, so there are top cards in each ink type that perform extremely well