Basalt Monolith + Training Grounds + Karn, the Great Creator

Prerequisites

• Basalt Monolith does not have summoning sickness.

Steps

1. 1Activate Karn's first loyalty ability by putting a loyalty counter on it, causing Basalt Monolith to become an artifact creature until end of turn.
2. 2Activate Basalt Monolith's first ability by tapping it, adding .
3. 3Activate Basalt Monolith's second ability by paying , untapping it.
4. 4Repeat.

Effects

• Infinite colorless mana