Nick Valentine, Private Eye + March of the Machines

Prerequisites

• You have a way to kill an artifact creature you control.

Steps

1. 1Kill an artifact creature you control.
2. 2Nick Valentine triggers, creating a Clue artifact token.
3. 3The Clue enters the battlefield as a 0/0 artifact creature due to March of the Machines, and dies as a state-based action due to having 0 toughness.
4. 4Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers