Mikaeus, the Unhallowed + Cauldron of Souls + Dross Scorpion + Ashnod's Altar

Prerequisites

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Steps

1. 1Activate Cauldron of Souls by tapping it, giving Dross Scorpion persist until end of turn.
2. 2Activate Ashnod's Altar by sacrificing Dross Scorpion, adding .
3. 3Dross Scorpion dies, triggering its ability, its undying ability and its persist ability.
4. 4Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
5. 5Resolve the Dross Scorpion persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
6. 6Activate Ashnod's Altar by sacrificing Dross Scorpion, adding .
7. 7Dross Scorpion dies, triggering its ability and its undying ability.
8. 8Resolve the first Dross Scorpion trigger, untapping Cauldron of Souls.
9. 9Resolve the second Dross Scorpion trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
10. 10Activate Ashnod's Altar by sacrificing Dross Scorpion, adding .
11. 11Dross Scorpion dies, triggering its ability and its persist ability.
12. 12Repeat from step 4.

Effects

• Infinite colorless mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers