Ixhel, Scion of Atraxa
Toxic 2 is the engine that pays for the card, not a flavor tax bolted onto an angel. The Corrupted trigger sits dormant until an opponent carries three or more poison counters, so the body's whole job is to close that gap: a 2/5 flier with vigilance drops two poison per connection and keeps its guard up, clearing the corruption threshold in two swings even against a defended board. Once an opponent crosses it, the reward lands on your own end step: each corrupted opponent exiles their top card face down, and the card hands you not just the right to play those cards but the fixing to cast anything they turn up, spending mana as though it were any color. That last clause is what raises it above a toxic beater. It resolves a tension poison strategies have always carried: they wanted to race and to grind at the same time, and few payoffs bridged the two. Here the counters do double duty, functioning as both the clock and the switch that flips a card-advantage engine feeding on the very opponents already being poisoned. The counter-payoff design has a natural governor built in: the trigger only advances against opponents who have already reached the threshold, and connecting for poison happens one target at a time, so a wide field stays a real board-management problem rather than a solved loop.
