Ronar Riftwielder

Whenever you cast an instant or sorcery spell, put a charge counter on Ronar Riftwielder.
Sacrifice Ronar Riftwielder: Add one mana
of any colour for each charge counter on
Ronar Riftwielder.
And in an instant the fire and fury fell away to reveal Ronar, white-hot and molten with the
power of the Heimrift itself.