Magical Exemplar

Whenever a noncreature spell is cast, add one "Spell
Counter" to this card.
{2} Remove any number of "Spell Counter" from this
card, cast a Spellcaster creature from your hand or
graveyard whith converted mana cost equals to that
number, without paying its mana cost.
(You may activate this ability any time you could play
a sorcery.)