Johnny Jon, Musical Mage

Vigilance
{x}{w}{w}{u}{u},{t}: Exile the top X cards of your
library. Put page counters on any instant or
sorcery cards with mana value X or less exiled
this way.
Whenever Johnny John attacks, you may cast any number of spells with page counters from exile.
After you cast these, instead of placing them in
your graveyard, they remain in exile with page counters on them.