Tiller of Flesh

Targeting is the hidden cost here, and the design turns it into a payoff. Most white removal, buffs, and combat tricks single out a permanent as a matter of course; this Knight sits behind those spells and skims a reward off each one, banking a two-counter Incubator every time you point something at the board. The trigger cares only that a spell targets one or more permanents, so an aura, a pump spell, or a piece of interaction all feed it equally, which is a broader net than the "removal matters" designs it resembles. The body is doing quiet work too: a 2/4 blocks and survives most of the early game while the tokens accumulate off in reserve, and each Incubator is a delayed 2/2 that flips for two mana on the turn you actually want a creature rather than one forced onto the board immediately. That decoupling is the interesting part: the value is stored as an artifact until you need a threat, so the engine doesn't overextend into a sweeper the way a stream of small creatures would. The archetype it wants is one already casting a lot of targeted spells, and it asks nothing extra of them: the targeting they were doing anyway is the whole trigger.