Hardened Academic + Putrid Goblin + Shilgengar, Sire of Famine

RWB identity

Commander legal

The 3 combo pieces

• Hardened Academic
• Putrid Goblin
• Shilgengar, Sire of Famine

How to execute it

1. Activate Shilgengar by sacrificing Putrid Goblin.
2. When Putrid Goblin dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. Hardened Academic triggers, putting a +1/+1 counter on Putrid Goblin.
4. Resolve the Shilgengar ability.
5. Repeat.

What the combo produces

• Infinite Blood tokens
• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite sacrifice triggers