Sedris, the Traitor King + Void Maw + Altar of Dementia + Witch Engine

Prerequisites

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Steps

1. 1Activate Altar of Dementia by sacrificing Witch Engine, causing target player to mill cards equal to Witch Engine's power.
2. 2Activate Witch Engine's unearth ability by paying , returning it from your graveyard to the battlefield, giving it haste and exiling it at end of turn or when it leaves the battlefield.
3. 3Activate Witch Engine by tapping it.
4. 4Holding priority, activate Altar of Dementia by sacrificing Witch Engine.
5. 5Both Witch Engine's undying ability and Void Maw attempt to exile Witch Engine when it would be put into your graveyard.
6. 6Choose to apply the Void Maw replacement effect, exiling Witch Engine.
7. 7Resolve the Witch Engine ability from step 3, adding .
8. 8Resolve the Altar of Dementia ability, causing target player to mill cards equal to Witch Engine's power.
9. 9Activate Void Maw by putting Witch Engine from exile into your graveyard, giving Void Maw +2/+2 until end of turn.
10. 10Repeat from step 2.

Effects

• Infinite black mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite mill
• Infinite self-mill
• Infinitely large creature until end of turn