Mikaeus, the Unhallowed + Cryptic Trilobite + Engineered Plague

Prerequisites

• "Trilobite" chosen with Engineered Plague.

Steps

1. 1Activate Cryptic Trilobite by removing a +1/+1 counter from it, adding that can only be spent to activate abilities.
2. 2Repeat step 1 until Cryptic Trilobite does not have any +1/+1 counters on it.
3. 3Cryptic Trilobite dies as a state-based action due to having 0 toughness.
4. 4Cryptic Trilobite's undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
5. 5Repeat.

Effects

• Infinite colorless mana that can only be spent to activate abilities
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers