|(Subtype for creature/tribal cards)|
100%as of Ikoria: Lair of Behemoths
Sponges are aquatic, chiefly marine animals, which have a porous structure and usually a horny, siliceous or calcareous internal skeleton. They occur in large, sessile colonies.
Though scientifically speaking there is no such thing as a walking sponge, both Magic sponges are shown to be mobile.