Ertha Jo, Frontier Mentor, Staff of Domination, and Incubation Druid

Prerequisites

• Ertha Jo, Frontier Mentor on the battlefield
• Staff of Domination on the battlefield
• Incubation Druid on the battlefield
• available

Steps

1. Activate Staff of Domination's third ability by paying , targeting Incubation Druid
2. Ertha Jo triggers, copying Staff of Domination's ability, targeting Incubation Druid
3. Resolve the first Staff of Domination ability, untapping Incubation Druid
4. Holding priority, activate Incubation Druid by tapping it, adding three mana of a color a land you control can produce Resolve the second Staff of Domination ability, untapping Incubation Druid
5. Activate Incubation Druid by tapping it, adding three mana of a color a land you control can produce Activate Staff of Domination's first ability by paying , untapping it
6. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Infinite lifegain
• Infinite lifegain triggers
• Infinite mana creatures you control can produce
• Infinite mana lands you control can produce
• Infinite untap of creatures you control