Mikaeus, the Unhallowed + Workhorse + Engineered Plague

Prerequisites

• "Horse" chosen with Engineered Plague.

Steps

1. 1Activate Workhorse by removing a +1/+1 counter from it, adding .
2. 2Repeat step 1 until Workhorse does not have any +1/+1 counters on it.
3. 3Workhorse dies as a state-based action due to having zero toughness.
4. 4Workhorse's undying ability triggers, returning it from your graveyard to the battlefield with five +1/+1 counters on it.
5. 5Repeat.

Effects

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