Ragnaros, Final Flamewreaker

1{p/u} Deal 8 damage. If it killed a minion, summon 2 2/2 Elementals.
At the end of your turn, deal 8 damage to all enemy minions and another 8 to a random enemy for each spell cast this turn.
After you have cast 4 spells whilst this was on the battlefield, summon an 8/8 elemental.