Mikaeus, the Unhallowed + Altar of Dementia + River Kelpie

Prerequisites

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Steps

1. 1Activate Altar of Dementia by sacrificing River Kelpie.
2. 2When River Kelpie dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. 3When River Kelpie enters, its first ability triggers, causing you to draw a card.
4. 4Resolve the Altar of Dementia ability.
5. 5Activate Altar of Dementia by sacrificing River Kelpie.
6. 6When River Kelpie dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
7. 7When River Kelpie enters, its first ability triggers, causing you to draw a card.
8. 8Resolve the Altar of Dementia ability.
9. 9Repeat.

Effects

• Infinite card draw
• Infinite draw triggers
• Infinite mill
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite mill
• Near-infinite sacrifice triggers