How can you create a combo with Najeela, the Blade-Blossom, Bear Umbra?
user
[START OF COMBO]This combo can be formed with Najeela, the Blade-Blossom, Bear Umbra

Color identity: WUBRG
Mana cost: 
Steps:
  1. Declare Najeela as an attacker, attacking an opponent unable to block and kill it.
  2. Najeela and Bear Umbra triggers.
  3. Resolve the Najeela trigger, creating a 1/1 Warrior creature token that is tapped and attacking.
  4. Resolve the Bear Umbra trigger, untapping all lands you control.
  5. Activate all lands you control by tapping them, adding {W}{U}{B}{R}{G}.
  6. Activate Najeela by paying {W}{U}{B}{R}{G}, untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
  7. Repeat each combat phase.[END OF COMBO STEPS]

Result:
  - Infinite combat phases
  - Infinite creature tokens
  - Infinite enters the battlefield
  - Infinite lifegain
  - Infinite lifegain triggers[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Bear Umbra attached to Najeela.
  - Najeela does not have summoning sickness.
  - An opponent is unable to kill Najeela.
  - Lands you control can tap to produce at least {W}{U}{B}{R}{G}.
[END OF COMBO PREREQUISITES]
assistant