Kitsa, Otterball Elite + Ashnod's Altar + Intruder Alarm + Under the Skin

Prerequisites

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Steps

1. 1Cast Under the Skin 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 Under the Skin.
4. 4Resolve the copy of Under the Skin, 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