Kitsa, Otterball Elite, Ashnod's Altar, Intruder Alarm, and Unnerving Grasp

Prerequisites

• Kitsa, Otterball Elite on the battlefield
• Ashnod's Altar on the battlefield
• Intruder Alarm on the battlefield
• Unnerving Grasp in hand
• available

Steps

1. Cast Unnerving Grasp by paying its mana cost
2. Kitsa's prowess ability triggers, giving it +1/+1 until end of turn
3. Holding priority, activate Kitsa's second ability by paying and tapping it, copying Unnerving Grasp
4. Resolve the copy of Unnerving Grasp, causing you to put a card from your library onto the battlefield face-down as a 2/2 creature
5. When the creature enters, Intruder Alarm triggers, untapping all creatures
6. Holding priority, activate Ashnod's Altar by sacrificing the face-down creature, adding
7. Repeat from step 3

Results

• Infinite self-mill
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite death triggers
• Near-infinite magecraft triggers
• Near-infinite sacrifice triggers
• Near-infinite untap of all creatures