Mikaeus, the Unhallowed + Defiant Greatmaw + Phyrexian Altar

Prerequisites

• Defiant Greatmaw does not have a +1/+1 counter on it.

Steps

1. 1Activate Phyrexian Altar by sacrificing Defiant Greatmaw, adding one mana of any color.
2. 2When Defiant Greatmaw dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
3. 3When Defiant Greatmaw enters the battlefield, its first ability triggers, putting two -1/-1 counters on it.
4. 4Defiant Greatmaw's second ability triggers, removing a -1/-1 counter from another creature you control.
5. 5Repeat.

Effects

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