Activate Phyrexian Colossus by paying 8 life.
Repeat step 1 until Greven has power 21 or greater due to its first ability.
Deal combat damage to an opponent using Greven. The opponent loses the game due to being dealt 21 or more combat damage from your commander.

Target opponent loses the game

Greven, Predator Captain

Phyrexian Colossus

Activate Phyrexian Colossus by tapping it, dealing eleven damage to any target and causing you to gain eleven life.
Activate Phyrexian Colossus by paying eight life, untapping it.
Repeat.

Infinite damage

Infinite lifegain

Infinite lifegain triggers

Burning Anger

Loxodon Warhammer

Activate Phyrexian Colossus by tapping it, dealing 8 damage to any target and causing you to gain eight life.
Activate Phyrexian Colossus by paying eight life, untapping it.
Repeat.

Basilisk Collar

Activate Necrotic Ooze using Auriok Bladewarden's ability by tapping it, giving itself +X/+X until end of turn, where X is Necrotic Ooze's power.
Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
Repeat two additional times.
Activate Necrotic Ooze using Tree of Redemption's ability by tapping it, causing you to swap your life total with Necrotic Ooze's toughness.
Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
Activate Necrotic Ooze using Auriok Bladewarden's ability by tapping it, giving itself +X/+X until end of turn, where X is Necrotic Ooze's power.
Activate Necrotic Ooze using Phyrexian Colossus' ability by paying eight life, untapping it.
Repeat from step 4.

Infinitely large creatures until end of turn

Necrotic Ooze

Tree of Redemption

Auriok Bladewarden

Activate Phyrexian Colossus by tapping it, dealing 9 damage to any target and causing you to gain nine life.
Activate Phyrexian Colossus by paying eight life, untapping it.
Repeat.

Combos with "Phyrexian Colossus"