Yidaro, Wandering Monster

Cycling normally offers a floor: a card you never wanted can at least trade itself for a fresh one. This turns that floor into a countdown. Each time you cycle it, the triggered ability slots it back into your library rather than leaving it dead in the graveyard, and you still draw off the cycle as normal. On the fourth cycle the trigger changes shape: instead of shuffling, it puts an 8/8 with haste and trample onto the battlefield from your graveyard, resolving before you draw. The cost of assembling it is entirely fungible with normal gameplay. You are not burning turns on a combo; you are paying here and there to smooth your draws, and the payoff accrues as a byproduct of doing what you were going to do anyway. That is the wrinkle worth sitting with: the counter tracks a card named Yidaro, not a specific copy, so multiple copies stack their cycles toward the same threshold, and the shuffle keeps giving you chances to draw into one to pitch. Because cycling is an activated ability usable at instant speed, the fourth one can go off on any turn, dropping a hasty trampler onto an open board on the opponent's end step or as a surprise blocker. The four-cycle requirement is what pays for the size: absent it, this would simply be a seven-mana beater you hard-cast. A finisher disguised as a cantrip.