Malenia, Blade of Miquella

Flying, first strike
Whenever Malenia, Blade of Miquella attacks,
put a rot counter on each creature defending
player controls.
Creatures your opponents control that have rot counters on them lose all activated abilities.
"I dreamt for so long. My flesh was dull gold... and
my blood, rotted. Corpse after corpse, left in my wake."