"Alfven Ato" (3)
: Add .
: Cavernous Maw becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater.
Gravestorm (When you cast this spell, copy it for each permanent put into a graveyard from the battlefield this turn.)
Investigate. (Create a Clue token. It's an artifact with ", Sacrifice this artifact: Draw a card.")
: The next face-down creature spell you cast this turn costs less to cast.
If turning a face-down permanent face up causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time.
Gatherer works better in the Companion app!
, Sacrifice this artifact: Draw a card.")