How can you create a combo with Emeria Shepherd, Felidar Guardian, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Emeria Shepherd, Felidar Guardian, Phyrexian Altar

Color identity: W
Mana cost: {3}{W}
Steps:
  1. Cast Felidar Guardian by paying {3}{W}.
  2. Felidar Guardian enters the battlefield, blinking Plains.
  3. Emeria Shepherd triggers.
  4. Holding priority, activate Phyrexian Altar by sacrificing Felidar Guardian, adding one mana of any color.
  5. Resolve the Emeria Shepherd trigger, returning Felidar Guardian from your graveyard to the battlefield.
  6. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Emeria Shepherd must be on the battlefield
  - Felidar Guardian must be in your hand
  - Phyrexian Altar must be on the battlefield
  - You control Plains.
[END OF COMBO PREREQUISITES]
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