Torioth The World Scorcher

As an additional cost to Summon Torioth The World Scorcher, pay 15 Mana. Reduce this cost by 1 for each dragon that died this game.
When this creature enters the battlefield from the hand or exile Deal Ten Damage to all Creatures and Planeswalkers your opponents control.
If this card would enter the graveyard from play, instead Suspend 8