Putrid Goblin, First Day of Class, and Mogg Raider

Prerequisites

• Putrid Goblin on the battlefield
• First Day of Class in hand
• Mogg Raider on the battlefield
• available

Steps

1. Cast First Day of Class by paying Activate Mogg Raider by sacrificing Putrid Goblin When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it
2. When Putrid Goblin enters, First Day of Class triggers, putting a +1/+1 counter on Putrid Goblin
3. Resolve the Mogg Raider ability
4. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB
• Infinite death triggers
• Infinite sacrifice triggers
• Infinitely large creatures you control until end of turn