Mycosynth Fiend

A creature whose entire payoff lives on the wrong side of the table. Most pump effects scale off something you control: your other creatures, your lands, cards in your hand. This one reads the opponent's poison total instead, which means it does nothing until a separate plan is already winning, and then it does a great deal. That inversion is the whole design conceit. In a deck genuinely committed to infect or proliferate, the body grows in lockstep with the clock you are already racing, so by the time the opponent sits at six or eight poison the 2/2 has quietly become a finisher that closes from a different angle than the one being defended. The dependency is obvious and intentional: drop it into a deck with no poison engine and it is a vanilla body with a blank line of text. That reliance on a board state you cannot generate yourself is what keeps a green three-drop with this kind of ceiling from being a free swing of stats; it rewards corruption you have to manufacture elsewhere, and it punishes opponents who chump-block their way to single-digit poison while leaving the real threat unblocked. The horror is poison made literal: a thing that feeds on the rot it sees in everyone else.