Hoopa, Spirit of Mischief

Flying, Deathtouch, Hexproof
{t}-Add {c}{c}{c}{c}
Once per turn, you may search your deck for a creature card and put it in your hand. The next creature spell you cast cost {3} less to cast.
Whenever an artifact enters the battlefield, you
may pay {3}. If you don't, transform Hoopa, Spirit
of Mischief.
"Hoopa is STRONG!"