Niv-Mizzet, Rejuvenated

Flying, protection from instants
Niv-Mizzet, Rejuvenated enters the battlefield with two +1/+1 counters on it for each other spell cast this turn.
{t}: Niv Mizzet deals X damage to target creature or player and you draw X cards, where X is Niv-Mizzet's power.
An old mind needs a youger body.