Isilda, Thief of Secrets

Flash, doublestrike

Blitz {u/b}

If you cast this spell for it's Blitz cost, search your opponents library for a non land permanent with CMC 3
or less. Put it onto the battlefield under your control, except its a clue token without power or toughness. It still has all abilities it had originally.
Whenever a spell you don't control enters the battlefield under your control, return Isilda, Thief of Secrets to your hand.