Kagala, the Cinderborn

When Kagala enters play, and at the beginning of
your upkeep, put a flame counter on it.

{t}: Add {r}. Use this mana only to cast instant or
sorcery spells, or activate Bloodrush abilities.

{t}, Remove X flame counters from it: Choose a
card you own in exile with mana value X or less.
You may activate Bloodrush abilities of that card
this turn as if it were in your hand.