How can you create a combo with The World Tree, Purphoros, God of the Forge?
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[START OF COMBO]This combo can be formed with The World Tree, Purphoros, God of the Forge

Color identity: WUBRG
Mana cost: {W}{W}{U}{U}{B}{B}{R}{R}{G}{G}
Steps:
  1. Activate The World Tree's second ability by paying {W}{W}{U}{U}{U}{B}{B}{R}{R}{G}{G}, tapping and sacrificing it, searching your library for Purphoros, if needed, and every other God and/or creature with changeling in your library and put them onto the battlefield.
  2. When the Gods enter the battlefield, Purphoros triggers for each God that entered except itself, if applicable.
  3. Resolve all Purphoros triggers, dealing damage to each opponent equal to twice the number of Gods that entered the battlefield.[END OF COMBO STEPS]

Result:
  - Near-infinite damage[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - The World Tree must be on the battlefield
  - Purphoros, God of the Forge must be on the battlefield or in the library
[END OF COMBO PREREQUISITES]
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