Spellbook

When Spellbook enters the battlefield, search
your library for and instant or sorcery with
converted mana cost 1 or 2 and exile it. Repeat
this process for instant and sorcery cards with converted mana costs 3 or 4 and 5 or 6.
{t}: You may cast an instant or sorcery card exiled
with Spellbook until end of turn. If a card would
be put into the graveyard this way, it instead
remains in exile.