Cast Angel's Grace by paying {W}, causing you to be unable to lose the game this turn.
Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to Grollub and reduing your lifetotal to one due to Angel's Grace.
Grollub triggers, causing each opponent to lose life equal to the damage dealt to it due to Tainted Remedy.
Each opponent loses the game due to having zero or less life.

Each opponent loses the game

Infinite lifeloss

Grollub

Tainted Remedy

Volcano Hellion

Angel's Grace

Cast Volcano Hellion by paying {2}{R}{R}.
Volcano Hellion enters the battlefield, dealing an arbitrarily large amount of damage to you and Grollub.
Grollub triggers, causing each opponent to lose life equal to the damage dealt to it due to Tainted Remedy.
Each opponent loses the game due to having zero or less life.

Combos with "Grollub"