Phyresis

An Aura that adds nothing to the creature's stats and changes only the kind of damage it deals: any damage the enchanted creature would deal to a player now arrives as poison counters instead, ticking toward the ten that infect substitutes for twenty life. Because the grant is infect itself and not a combat-only rider, it rewrites every damage source the creature has, not just attacks: a pinger's tap ability, a fight spell's exchange, anything that routes damage at a player or creature now does so on the poison axis. The math is the appeal. Strap this onto a 5/5 and each connection lands five poison, so two unblocked swings close the game on a clock twenty life never offered. The fragility is the cost: two cards committed to one body, and any removal aimed at the enchanted creature answers both at once, the perennial tax an Aura pays. The generality of the grant is what lifts it above a pump effect, but generality has a ceiling, because infect does not stack. A creature that already has the keyword gains nothing from a second instance, so the Aura's value is strictly binary: it flips a creature's damage from life-loss to poison and goes no further. That makes it the cleanest possible isolate of the mechanic, infect with the body removed and only the alternate win condition left, asking one thing in return: keep a single attacker alive long enough to run the poison clock out.