Declare Mobile Garrison and Najeela, if able, as attackers.
Mobile Garrison triggers, as well as Najeela if it was declared an attacker.
Resolve the Mobile Garrison trigger, untapping Faeburrow Elder.
Resolve the Najeela trigger, if applicable, creating a 1/1 Warrior creature token that is tapped and attacking.
Holding priority, activate Faeburrow Elder by tapping it, adding .
Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat each combat phase.
This elegant loop turns a modest combat step into a relentless assault, fueled by Najeela, the Blade-Blossom generating a growing army of attacking Warrior tokens with every swing. Mobile Garrison plays a crucial catalytic role here: whenever it attacks, its triggered ability untaps another target artifact or creature you control, allowing it to systematically ready your mana producer. That crucial mana is provided by Faeburrow Elder, whose tap ability scales with the colors among your permanents to easily yield the exact five-color mana payment {W}{U}{B}{R}{G} required to activate Najeela's ultimate combat-resetting ability. By chaining these untap triggers and extra combat steps together, you untap your entire attacking squad over and over again for an unstoppable, game-winning swarm.