Harry Dresden

Whenever you cast an instant or sorcery with converted mana cost of 5 or greater, add mana of any one color to your mana pool equal to the converted mana cost of that instant or sorcery.
Whenever you cast an instant or sorcery with converted mana cost 4 or less, draw a card.
{x}{t}; Prevent the next X damage deal to this creature, then deal X damage to any target.