Kindred of Rot's Exultation

If rot or poison are on the battlefield the equipped creature gains +X/+0 where X is the equipped creature's power. (Scarlet Aeonia, Malenia, Cleanrot Knight, Grand Cloister,
and any swamp activate this.)

"Rot for the scarlet goddess. O scarlet blossoms, flourish in distant lands, and return
to us, the unwanted children."