Plague Dogs

Two abilities, one death event, and the design hinge is that they feed each other rather than compete. The sacrifice ability is an escape hatch and the death trigger is a delayed mini-wrath, but the elegant part is that paying to sacrifice still fires the trigger: cash the body for a card and shrink the whole board on the way out, both at once. That overlap is what keeps the card from ever being dead weight. The floor is reasonable (sacrifice for a card, nick a point of toughness off everything) and the ceiling is the same event paying off twice: a self-replacing sweeper that clears every one-toughness creature on the table. The only real decision is timing: hold it while there is a swarm of tokens or one-drops worth catching, or cash it early when there is nothing to sweep, knowing the -1/-1 fires either way. The Phyrexian flavor is doing honest work too: a diseased hound whose entire function is to die and infect everything around it, a black common in an artifact-soaked era handed a built-in plague payload. It reads like a value engine and plays like a board-control piece that happens to draw a card, with one deliberate cap on the whole package: the sweep clips just one toughness and only triggers when you give up the body, so you get a single swing of it and no more.