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

Spell with Kicker or Multikicker

Hallar, the Firefletcher

Grafted Exoskeleton

Activate Phyrexian Devourer by paying {0}, exling the top card of your library and putting a number of +1/+1 counters on Phyrexian Devourer equal to that card's mana value.
If Phyrexian Devourer's power becomes seven or greater this way, it triggers.
Holding priority, repeat from step 1 until you have an empty library.
Resolve the first Phyrexian Devourer trigger, causing you to sacrifice it.
When Phyrexian Devourer leaves the battlefield, The Ozolith triggers, putting a number of +1/+1 counters onto itself equal to the number Phyrexian Devourer had.
At the beginning of combat, The Ozolith triggers, moving its counters from itself to Hallar.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Exile your library

Near-infinite +1/+1 counters on a creature

Near-infinite damage

Phyrexian Devourer

The Ozolith

Activate Phyrexian Devourer by paying {0}, exling the top card of your library and putting a number of +1/+1 counters on Phyrexian Devourer equal to that card's mana value.
If Phyrexian Devourer's power becomes seven or greater this way, it triggers.
Holding priority, repeat from step 1 until you have an empty library.
With the Phyrexian Devourer triggers on the stack, cast Slippery Bogbonder by paying {3}{G}.
When Slippery Bogbonder enters the battlefield, it triggers, moving all +1/+1 counters from Phyrexian Devourer onto Hallar.
Resolve all Phyrexian Devourer triggers from step 2, causing you to sacrifice it.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Slippery Bogbonder

Cast Body of Research by paying {G}{G}{G}{U}{U}{U}, creating a 0/0 Fractal creature token, then putting a number of +1/+1 counters on it equal to your deck size.
Cast Bioshift by paying {G/U}, moving all +1/+1 counters from the Fractal onto Hallar.
The Fractal dies as a state-based action due to having zero toughness.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Body of Research

Bioshift

Activate Phyrexian Devourer by paying {0}, exling the top card of your library and putting a number of +1/+1 counters on Phyrexian Devourer equal to that card's mana value.
If Phyrexian Devourer's power becomes seven or greater this way, it triggers.
Holding priority, repeat from step 1 until you have an empty library.
With the Phyrexian Devourer triggers on the stack, cast Bioshift by paying {G/U}, moving all +1/+1 counters from Phyrexian Devourer onto Hallar.
Resolve all Phyrexian Devourer triggers from step 2, causing you to sacrifice it.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Cast Body of Research by paying {G}{G}{G}{U}{U}{U}, creating a 0/0 Fractal creature token, then putting a number of +1/+1 counters on it equal to your deck size.
Cause the Fractal to leave the battlefield.
The Ozolith triggers, putting a number of +1/+1 counters onto itself equal to the number the Fractal had.
At the beginning of combat, The Ozolith triggers, moving its counters from itself to Hallar.
Cast any kicker or multikicker spell with kicker by paying its mana cost plus its kicker cost.
Hallar triggers, putting a +1/+1 counter on itself, then dealing damage equal to the number of +1/+1 counters on it to each opponent.

Combos with "Hallar, the Firefletcher"