Najeela, the Blade-Blossom, Mobile Garrison, and Faeburrow Elder

Prerequisites

• Najeela, the Blade-Blossom on the battlefield
• Mobile Garrison on the battlefield
• Faeburrow Elder on the battlefield
• Mobile Garrison is a creature
• Mobile Garrison and Faeburrow Elder do not have summoning sickness
• You control at least one blue and at least one black permanent
• An opponent cannot block and kill Mobile Garrison

Steps

1. Declare Mobile Garrison and Najeela, if able, as attackers
2. Mobile Garrison triggers, as well as Najeela if it was declared an attacker
3. Resolve the Mobile Garrison trigger, untapping Faeburrow Elder
4. Resolve the Najeela trigger, if applicable, creating a 1/1 Warrior creature token that is tapped and attacking
5. Holding priority, activate Faeburrow Elder by tapping it, adding
6. Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one
7. Repeat each combat phase

Results

• Infinite combat phases
• Infinite creature tokens with haste
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers