Ara, Asura

Flash, First Strike, Ninjutsu {w}{r} ({w}{r}, Return an unblocked attacker you control your hand: Put this card onto the battlefield from your hand tapped and attacking.)
When this creature enters the battlefield, target opponent sacrifices a creature.
{2}{r/w}{r/w}: Transform this creature.
"Do you want to grow stronger? Accept me if you desire growth...! Together with me... You'll be able to overcome your destiny and trials!" -Eun