Ophidian

The original "draw a card by hitting them" creature, and the template every unblockable card-advantage engine since has answered to. The design idea is a deliberate tension: a 1/3 body, sturdy enough to survive on defense but too small to threaten much on offense, so the card asks whether you would rather poke for one or trade that point of damage for a card. The decline-damage clause is what stops it from spiraling: without that toll, the trigger would become a Curiosity-style runaway, but as printed it forces a real choice every combat. What followed is a whole lineage of attack-trigger draw effects: Ophidian Eye chases the same fantasy as an enchantment, Thieving Magpie pushed the rate to evasion-plus-a-bigger-body, and Coastal Piracy generalized the trigger across a whole board. None of them retired the original idea, because the original idea is so clean: a creature that turns the combat step into a recurring card-draw decision, with the cost paid in the very damage that combat is supposed to deliver. It reads as a slow grinder rather than a finisher, and that is the point; this is a creature that wins the long game by refusing to spend its attacks on the short one.