Secunda, Nightingale Thief

Surveil 3, Skulk, Undying
Pilfer 5 - Whenever this creature attacks a player directly, you may choose a card at random from their hand and reveal it. If that card has a mana cost of 5 or less, you may exile it and play it for it's mana cost, mana spent to cast this spell is treated as being of any color.
Ninjitsu {1}{b}{u} ({1}{b}{u} Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)