Dream Catcher

Coalesce {1}{w}{u}{u}- Whenever an opponent casts an instant or sorcery, You may cast this card for its coalesce cost.
Counter the spell that caused Dream Catcher to coalesce. At the beginning of your next upkeep add X mana of any color to your mana pool, where X was that spell's converted mana cost. Only use this mana on instant or sorcery spells.