Hallar, the Firefletcher + Corrupted Conscience Combo

Spell with Kicker or Multikicker in hand.

Hallar and Corrupted Conscience on the battlefield (Corrupted Conscience attached to Hallar on the battlefield).

Hallar has a number of +1/+1 counters on it equal to or greater than 9 minus the smallest number of poison counters an opponent has. You have enough mana to cast the spell with kicker or multikicker, and there are legal target(s) for that spell, if applicable.

Cast the spell with kicker or multikicker by paying its mana cost plus its kicker cost at least once.

Hallar triggers, putting a +1/+1 counter on it, then causing each opponent to get a number of poison counters equal to its power.

Each opponent loses the game.

Each opponent loses the game