MTG Un-sets Un-sets in MTG are designed for very casual play, presenting wild and experimental gameplay ideas that make all of their cards illegal to use in tournament formats
Unfortunately for us, Mnemonic Wall has a triggered ability instead of an activated ability, so it's not quite as efficient as some of the other cards we've gotten used to
Sisus ability goes a bit further, though, because it allows you to choose which card you take, instead of throwing yourself completely at the mercy of a random draw
She also populates your squirrels twice or your non-squirrel tokens once on your end step
Tifa Lockhart This isn't an infinite combo, but it is a nifty turn-3 kill in Standard, so I had to throw it in here anyway
Flameshadow Conjuring: as a 4 drop it will help in Standard constructed, not sure for Modern