Behold the Infinite

Exile Behold the Infinite. Search your library
for up to X instant and/or sorcery cards, reveal
them, put them into your hand, then shuffle
your library. If X is greater than 1, until end of
turn, you may cast instant and sorcery spells
from your hand without paying their mana costs.
At the beginning of the next end step, If X was 5
or greater, return all instant and sorcery cards
from your graveyard to your hand.