Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to you and target creature, and causing you to gain life equal to the total amount of damage done this way.

Infinite lifegain

Volcano Hellion

Whip of Erebos

Cast Volcano Hellion.
When it enters the battlefield, it does near infinite damage to you and to Coalhauler Swine, and you gain life equal to the damage dealt.
Coulhauler Swine deals that much damage to each player, gaining you that much life.

Combos with "Whip of Erebos"