How can you create a combo with Purphoros, Bronze-Blooded, Firestorm Phoenix, Thermopod, Training Grounds?
user
[START OF COMBO]This combo can be formed with Purphoros, Bronze-Blooded, Firestorm Phoenix, Thermopod, Training Grounds

Color identity: UR
Mana cost: {R}
Steps:
  1. Activate Purphoros by paying {R}, putting Firestorm Phoenix onto the battlefield from your hand.
  2. Activate Thermopod's second ability by sacrificing Firestorm Phoenix, adding {R}.
  3. Firestorm Phoenix is returned to your hand instead of being put into your graveyard.
  4. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite enters the battlefield
  - Infinite leaves the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Purphoros, Bronze-Blooded must be on the battlefield
  - Firestorm Phoenix must be in your hand
  - Thermopod must be on the battlefield
  - Training Grounds must be on the battlefield
[END OF COMBO PREREQUISITES]
assistant