mtg are unfinity cards legal in commander un-set will be Unfinity Release Notes | Magic:

When this artifact has twenty or more charge counters on it, you win the game

As a sorcery, you may pay the mana cost of a locked door to unlock it.) Enchantment - Room Duke Ulder Ravengard At the beginning of combat on your turn, another target creature you control gains haste and myriad until end of turn

Its got 180 cards in the set, which is more than triple Print and Plays while being a more reasonable number for a hobbyist than Amazons 500

More importantly, these cards dont exile themselves upon resolution like modern extra turn spells do, which means all the Regrowth effects and Snapcaster Mage variants you can justify stuffing in your deck become much stronger