Basalt Monolith + Heartstone + Karn, the Great Creator

Prerequisites

• Basalt Monolith does not have summoning sickness.

Steps

1. 1Activate Karn's first loyalty ability, 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's Monolith's last ability by paying , untapping it.
4. 4Repeat.

Effects

• Infinite colorless mana