Stonybrook Schoolmaster, Paradise Mantle, Umbral Mantle, and Training Grounds

Prerequisites

• Stonybrook Schoolmaster on the battlefield
• Paradise Mantle on the battlefield
• Umbral Mantle on the battlefield
• Training Grounds on the battlefield
• Stonybrook Schoolmaster does not have summoning sickness
• Umbral Mantle and Paradise Mantle attached to Stonybrook Schoolmaster

Steps

1. Activate Stonybrook Schoolmaster by tapping it, adding
2. Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard creature token
3. Activate Stonybrook Schoolmaster by paying and untapping it, giving it +2/+2 until end of turn
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinitely large Stonybrook Schoolmaster until end of turn