Dwilith Spelunker

When Dwilith Spelunker enters the battlefield, you
get {e}{e} (two energy counters).
Pay {e}{e}: Add {r}{r}. This mana can only be spent
to cast instant and sorcery spells. Activate only if
Dwilith Spelunker attacked this turn.
A dwarf that seeks the next frontier,
Shall see an aether spout appear.
— Song of Dwilith