Lullmage Mentor, Doubling Season, Exalted Sunborn, and Mondrak, Glory Dominus

Prerequisites

• Lullmage Mentor on the battlefield
• Doubling Season on the battlefield
• Exalted Sunborn on the battlefield
• Mondrak, Glory Dominus on the battlefield

Steps

1. Whenever an opponent casts a spell, activate Lullmage Mentor by tapping seven untapped Merfolk, countering that spell
2. Lullmage Mentor triggers, creating a total of eight 1/1 Merfolk creature tokens
3. Repeat

Results

• Near-infinite ETB
• Counter all spells opponents cast
• Near-infinite tapped creature tokens