Aeonian Butterfly

Flying

Rot {1}: Whenever Aeonian Butterfly attacks, you
may pay {1}. If you do, you may either sacrifice Aeonian Butterfly or lose 1 life. If you sacrifice Aeonian Butterfly, target defending player gains 1
Rot Counter. If you lose one life, you lose one Rot Counter.

"According to myth, these butterflies were once the wings of the Goddess of Rot herself."