Urza, Prince of Kroog + Encroaching Mycosynth + Training Grounds + Urza, Lord High Artificer

Prerequisites

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Steps

1. 1Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
2. 2Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
3. 3Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
4. 4Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
5. 5Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
6. 6Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
7. 7Repeat from step 5.

Effects

• Infinite creature ETB
• Infinite tapped creature tokens