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Arm with AEther
{2}{U}
Sorcery
Until end of turn, creatures you control gain "Whenever ~this~ deals damage to an opponent, you may return target creature that player controls to its owner's hand."

Mistblade Shinobi
{2}{U}
Creature -- Human Ninja
1/1
Ninjutsu {U} ({U}, Return an unblocked attacker you control to hand: Put ~this~ onto the battlefield from your hand tapped and attacking.)
Whenever ~this~ deals combat damage to a player, you may return target creature that player controls to its owner's hand.