Bha'Riel, Draconic Disaster

Flying, Haste
Whenever you cast an Instant or Sorcery spell,
you may pay {r}. If you do Bha'riel deals damage
to target creature equal to that spell's mana cost.
Whenever Bha'riel deals damage to a creature
you may pay {u}. If you do, Tap that creature,
it doesn't untap during it's controller's next
untap step.