
Flying
Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn.
Mercurial Geists has 3 printings, first in Eldritch Moon (2016). EDHREC ranks it #26,243 among Commander cards. It appears most in Tibor and Lumia decks (91 on EDHREC).
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.