
Each creature spell you cast costs {1} less to cast if it has mutate.
Whenever you cast a creature spell, if it has mutate, draw a card, then discard a card.
Pollywog Symbiote has 3 printings, first in Ikoria: Lair of Behemoths (2020). EDHREC ranks it #9,230 among Commander cards. It appears most in Otrimi, the Ever-Playful decks (3,075 on EDHREC). It has 5 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.