Coercive Recruiter, Thraben Doomsayer, and Conspiracy

Prerequisites

• Coercive Recruiter on the battlefield
• Thraben Doomsayer on the battlefield
• Conspiracy on the battlefield
• Thraben Doomsayer does not have summoning sickness
• "Pirate" chosen with Conspiracy

Steps

1. Activate Thraben Doomsayer by tapping it, creating a 1/1 Human creature token
2. When the Human enters the battlefield as a Pirate due to Conspiracy, Coercive Recruiter triggers, untapping Thraben Doomsayer
3. Repeat

Results

• Infinite creature tokens
• Infinite ETB