Body of Knowledge

Damage-triggered card draw inverts the usual liability of a hand-sized body: the more a source of damage tries to shrink your grip, the more it feeds it, and every card you draw makes the body bigger. The no-maximum-hand-size clause is the load-bearing piece here. It exists so the drawn cards actually stay drawn, letting the toughness ratchet upward across turns instead of getting shaved back to seven each end step. Point a repeatable, sublethal damage source at it (a pinger that hits all creatures, an activated ability you control) and it draws while surviving, each ping banking cards that thicken it against the next one. The interaction has a hard ceiling that is easy to misread: state-based actions check lethal damage before the draw trigger goes on the stack, so a hit that already exceeds its current toughness kills it before you draw anything. The cards you gain only defend against future damage, never the blow that earned them. That timing rule defines how you have to use it: you want a steady drip of small hits, not a single big one, and you want the toughness padded before the damage lands rather than after. The whole engine also rides on keeping a full hand, so a discard effect or a forced empty grip collapses it back toward nothing. It is a permanent that wants to be shot, but only carefully, and only by a gun you built to fire in taps.