Wildfire

Whenever you cast an instant or sorcery spell, creatures you control get +1/+0 until end of turn
Whenever you would deal damage to a creature
or player, you deal that much damage plus X to
that creature or player instead, where X is the
number of instant or sorcery spells you've cast
this turn.
Fire, like many things, is easy to loose control of.
Unlike many things, fire is hard to regain control of.