Glistering Fae

Flying
Conceil(Pay any mana to cast this conceiled.
Exile it face down and put a number of color
counters on it for each color spent.
You may play the card any time without paying
its mana cost, if the counters provide for it.
Otherwise the spell is put into the graveyard.)
When Glistering Fae enters the battlefield you
may cast spells at instant speed until the next
player's turn.