Chevill, Bane of Monsters

The upkeep trigger tags one of their creatures or planeswalkers with a bounty counter, but the reward (three life and a card) only fires when that permanent dies, and the counter re-arms only once every bounty on their side is gone. The elegance is that the payout is fully within your control: point a removal spell at the bountied permanent yourself and you both clear a threat and collect the loot, so the counter effectively refunds your interaction. Deathtouch closes the same loop from the other direction, turning a defensive body into a kill-on-contact blocker that converts any bountied attacker into a death trigger. The opponent's choices only narrow the trap further: leave the marked permanent alive and you hold a permanent tax on their board while the counter waits; trade it away and you draw the card regardless of who did the killing. That is what elevates a 1/3 for two beyond a durdle. The design collapses removal, card advantage, and life gain into a single passive engine that compounds as long as the game keeps producing dead permanents on the far side of the table, and it runs that engine from behind a wall the deathtouch makes genuinely unpleasant to attack into.