What are the abilities of Geistflame Reservoir?
user
Whenever you cast an instant or sorcery spell, put a charge counter on Geistflame Reservoir.\n{1}{R}, {T}, Remove any number of charge counters from Geistflame Reservoir: It deals that much damage to any target.\n{1}{R}, {T}: Exile the top card of your library. You may play that card this turn.
assistant