Aluren, Concordant Crossroads, and Ovinomancer

Prerequisites

• Aluren on the battlefield
• Concordant Crossroads on the battlefield
• Ovinomancer in hand
• There is at least one creature on the battlefield

Steps

1. Cast Ovinomancer by paying
2. Ovinomancer enters the battlefield, triggering its first ability
3. Holding priority, activate Ovinomancer's second ability by tapping it and returning it from the battlefield to your hand, destroying target creature and causing its controller to create a 0/1 Sheep creature token
4. Resolve the Ovinomancer trigger from step 2, choosing not to return any lands to your hand
5. Repeat
6. You may also repeat this loop whenever a creature enters the battlefield under an opponent's control

Results

• Destroy all creatures opponents control
• Destroy all creatures that enter the battlefield under an opponent's control
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite storm count