Nashi, Moons Legacy I originally misread Nashi, Moon's Legacy, thinking it let you cast its copies for free
However, while Exiled cards used to be considered removed from the game, the Exile zone has since become a mechanic itself
Bouncing permanents, tapping down a board before attackers, or even countering a spell all on top of drawing a card is just so good
Also, it can target the opponent, so you can actually burn your opponent out with it (Ive done it and it has been done to me in Commander of all formats)
I don't see this getting much, if any love, simply due to the way Infest scales poorly into the late game
There are so many, but one of my favourites is River Song