River Serpent
From Amonkhet set
River Serpent
Creature — Serpent
5/5
This creature can't attack unless there are five or more cards in your graveyard.
Cycling
(
, Discard this card: Draw a card.)
Rulings
- Once River Serpent has attacked, it will remain in combat even if the number of cards in your graveyard becomes four or fewer.