Urza, Prince of Kroog + Grim Monolith + Mondrak, Glory Dominus + Lightning Greaves

Urza, Prince of Kroog

Grim Monolith

Mondrak, Glory Dominus

Lightning Greaves

How it works

1. Activate Grim Monolith's first ability by tapping it, adding CCC.
2. Activate Urza by paying 6, creating two token copies of Grim Monolith that are 1/1 Soldiers in addition to their other types.
3. Activate Lightning Greaves' equip ability by paying 0, attaching it to a Grim Monolith token.
4. Activate the Grim Monolith token's first ability by tapping it, adding CCC.
5. Repeat from step 3 using the other Grim Monolith token.
6. Repeat from step 2.

This engine starts by leveraging Grim Monolith to generate initial mana, which Urza, Prince of Kroog then uses to churn out token copies of the monolith. Because Mondrak, Glory Dominus is on the battlefield, any token creation is doubled, turning Urza's single-token activation into a pair of new artifacts. Finally, Lightning Greaves ensures these fresh 1/1 Soldier artifact copies can immediately tap for mana the turn they arrive, fueling the loop to infinitely repeat and flood your board with tapped creature tokens.