Acheron, Nihility's Bane

Rainblade - Creatures you control have "When this creature attacks, target opponent or creature gains a slashed dreams counter." This ability triggers only twice each turn. Whenever Acheron attacks, up to three target opponents or creatures gain a slashed dreams counter.

Stygian Resurge - Whenever Acheron attacks, you may pay {1}{u}{g}{r} and remove all slashed dreams counters from all permanents or players, then Acheron deals combat damage to each target that had a slashed dre