Anzrag, the Quake-Mole + Darksteel Mutation

Prerequisites

• An opponent controls exactly one creature.
• Anzrag does not have summoning sickness.

Steps

1. 1Activate Anzrag by paying , causing opponents to block Anzrag if able this turn.
2. 2Cast Darksteel Mutation for targeting the only creature an opponent controls.
3. 3Resolve Darksteel Mutation, turning the enchanted creature into a 0/1 Insect artifact creature with indestructible.
4. 4Declare Anzrag as an attacker, attacking the opponent who controls the enchanted creature.
5. 5The opponent is forced to block Anzrag with the enchanted creature, triggering Anzrag, untapping all creatures you control and causing you to get an additional combat phase after this one.
6. 6Repeat from step 4.

Effects

• Infinite combat phases
• Infinite mana creatures you control can produce
• Infinite untap of creatures you control