Capturing Spellbook

{t}: Exile an instant or sorcery from your hand.
{x}{t} : Cast target instant or sorcery spell with X
or less casting cost exiled by Capturing Spellbook .
Put a Page counter on Capturing Spellbook.
Spells Cast with Capturing Spellbook
cost X less to cast, where X is the number of
page counters on Capturing Spellbook .