Rio Vidal

When this creature enters the battlefield, you may exile X creatures from your graveyard, and Rio Vidal gains X +1/+1 counters.

When a creature is destroyed by damage dealt by Rio Vidal you may return a creature from your graveyard to the battlefield tapped.
Rio cannot be on the battlefield at the same time as Agatha Harkness. If Agatha Harkness is your commander Rio can Partner with them

"Less a green witch,
more like THE GREEN WITCH"