Cast Karn's Touch by paying {U}{U}, causing Aetherflux Reservoir to become an artifact creature until end of turn.
Give Aetherflux Reservoir lifelink.
Activate Aetherflux Reservoir by paying 50 life, dealing 50 damage to any target and causing you to gain 50 life.
Repeat step 3.

Infinite damage

Infinite lifegain triggers

Aetherflux Reservoir

Karn's Touch

Cast Karn's Touch by paying {U}{U}, causing Basalt Monolith to become an artifact creature until end of turn.
Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Activate Basalt Monolith's second ability by paying {1}, untapping it.
Repeat.

Infinite colorless mana

Training Grounds

Basalt Monolith

Cast Karn's Touch by paying {U}{U}, targeting Basalt Monolith.
Activate Basalt Monolith's first ability by tapping it, adding {C}{C}{C}.
Activate Basalt's Monolith's last ability by paying {2}, untapping it.
Repeat.

Heartstone

Cast Karn's Touch by paying {U}{U}, targeting Gilded Lotus.
Activate Umbral Mantle's equip ability by paying {0}, attaching it to the Gilded Lotus.
Activate Gilded Lotus by tapping it, adding three mana of any one color.
Activate Umbral Mantle by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.

Infinitely large creature until end of turn

Gilded Lotus

Umbral Mantle

Cast Karn's Touch by paying {U}{U}, targeting Thran Dynamo.
Activate Umbral Mantle's equip ability by paying {0}, attaching it to the Thran Dynamo.
Activate Thran Dynamo by tapping it, adding {C}{C}{C}.
Activate Umbral Mantle by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.

Thran Dynamo

Activate Chromatic Orrery's first ability by tapping it, adding {5}.
Cast Karn's Touch by paying {2}, causing Chromatic Orrery to become an artifact creature until end of turn.
Activate Umbral Mantle's equip ability by paying {0}, attaching it to Chromatic Orrery.
Activate Chromatic Orrery by paying {3} and untapping it, giving it +2/+2 until end of turn.
Activate Chromatic Orrery's first ability by tapping it, adding {5}.
Repeat from step 4.
Once you have infinite mana, you may instead use Chromatic Orrery's second ability if you control a colored permanent.

Combos with "Karn's Touch"