Kiora, the Tide's Fury
Conjure is the tell: the first ability manufactures a card named Kraken Hatchling directly into your hand, an effect the paper rules engine cannot replicate because it fabricates a specific named printing rather than searching a library for it. That mechanic is the whole engine. The two +1 abilities feed the minus from different directions: one stocks your hand with the fuel, the other is a protective untap that reads as filler until you notice a walker with two loyalty-additive options can hold at four or higher while it builds toward a board. The -3 is live the moment a Kraken exists, so there is no ramp on the ultimate: Kiora can sacrifice a Hatchling to spit out an 8/8 as early as her second activation. What makes the loop interesting is that the sacrifice is optional and the token is not free; you have to bank the fuel first, which turns a generically-costed walker into a self-contained value cycle that rewards you for stacking conjured 0/4s across turns and converting them one at a time. This is a planeswalker built around a keyword the physical game has no way to support, and that constraint is exactly why it lives where it does.
