How can you create a combo with Mayael's Aria, Wall of Blood?
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[START OF COMBO]This combo can be formed with Mayael's Aria, Wall of Blood

Color identity: BRGW
Mana cost: 
Steps:
  1. At the beginning of your upkeep, Mayael's Aria triggers.
  2. Holding priority, activate Wall of Blood by paying 1 life, giving it +1/+1 until end of turn.
  3. Repeat step 2 until Wall of Blood's power is equal to nineteen.
  4. Resolve the Mayael's Aria trigger, causing you to put a +1/+1 counter on each creature you control, gain ten life, and win the game.[END OF COMBO STEPS]

Result:
  - Win the game at the beginning of your next upkeep[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Your life total is greater than or equal to twenty.
[END OF COMBO PREREQUISITES]
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