Squee's Sack

Hideaway (This artifact enters the battlefield tapped.
When it does, look at the top four cards of your library,
exile one face down, then put the rest on the bottom
of your library.)
{t}: Add {r} to your mana pool.
{r}, {t}: You may play the exiled card without
paying its mana cost if you cast two or more
spells this turn.
"It's in here somewhere!" —Squee