Urza, Prince of Kroog + Powerstone Shard + Akroma's Memorial

Prerequisites

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Steps

1. 1Activate Urza by paying , creating a token copy of Powerstone Shard that is a 1/1 Soldier in addition to its other types.
2. 2Activate the Powerstone Shard token by tapping it, adding for each Powerstone Shard you control.
3. 3Repeat two additional times.
4. 4Activate the original Powerstone Shard by tapping it, adding for each Powerstone Shard you control.
5. 5Repeat steps 1 through 3.

Effects

• Infinite colorless mana
• Infinite creature copies of artifacts you control
• Infinite creature tokens with haste
• Infinite ETB