Kitsa, Otterball Elite + Ashnod's Altar + Intruder Alarm + Break Down the Door

Prerequisites

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Steps

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

Effects

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