How can you create a combo with Gerrard, Weatherlight Hero, Molten Echoes, Altar of Dementia?
user
[START OF COMBO]This combo can be formed with Gerrard, Weatherlight Hero, Molten Echoes, Altar of Dementia

Color identity: RW
Mana cost: {2}{R}{W} plus enough mana to pay for commander tax, if applicable
Steps:
  1. Cast Gerrard either from your graveyard or from the command zone by paying {2}{R}{W} and commander tax, if applicable.
  2. Gerrard enters the battlefield, triggering Molten Echoes, creating a token copy of Gerrard with haste.
  3. Put the nontoken Gerrard into your graveyard due to the legend rule.
  4. The nontoken Gerrard dies, triggering its ability.
  5. Holding priority, activate Altar of Dementia by sacrificing the token Gerrard.
  6. The token Gerrard dies, exiling itself and returning the nontoken Gerrard from your graveyard to the battlefield.
  7. Repeat from step 2 an arbitrarily large number of times.
  8. Resolve all Altar of Dementia abilities, causing any number of players to mill infinite cards.[END OF COMBO STEPS]

Result:
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mill
  - Infinite sacrifice triggers
  - Infinite self-mill[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Gerrard, Weatherlight Hero must be in your hand or in the command zone
  - Molten Echoes must be on the battlefield
  - Altar of Dementia must be on the battlefield
  - "Human" or "Soldier" chosen with Molten Echoes.
[END OF COMBO PREREQUISITES]
assistant