Urza, Prince of Kroog + Doubling Cube + Ring of Valkas

Urza, Prince of Kroog

Doubling Cube

Ring of Valkas

How it works

1. Float at least 11.
2. Activate Doubling Cube by paying 3 and tapping it, adding at least 8.
3. Activate Urza by paying 6, creating a token copy of Doubling Cube that is a 1/1 Soldier.
4. Activate Ring of Valkas' equip ability by paying 1, attaching it to the Doubling Cube token.
5. Repeat from step 2 using the Doubling Cube token instead.
6. Once you have infinite mana, you may target any artifact you control to get infinite copies of them.

This marvelous engine takes off once you have enough starting mana to activate Doubling Cube and Urza, Prince of Kroog in tandem. By paying to copy the Doubling Cube with Urza, Prince of Kroog, you bring a fresh, untapped artifact copy onto the battlefield that can immediately tap to double an even larger mana pool. To make this token immediately usable despite summoning sickness, Ring of Valkas steps in with its low equip cost to grant the necessary haste. By repeating this loop, you generate infinite mana and can eventually pivot Urza, Prince of Kroog's ability to duplicate any other artifact you desire infinitely.