Najeela, the Blade-Blossom, and Shriekwood Devourer

Prerequisites

• Najeela, the Blade-Blossom on the battlefield
• Shriekwood Devourer on the battlefield
• You control up to five lands that can tap to produce at least
• You control a creature with power 5 or greater that does not have summoning sickness, and that cannot be blocked and killed by an opponent

Steps

1. Declare any creature with power 5 or greater that cannot be blocked and killed by an opponent as an attacker
2. Shriekwood Devourer triggers, and Najeela triggers if a Warrior attacked
3. Resolve the Najeela trigger, if applicable, creating a 1/1 Warrior creature token that is tapped and attacking
4. Holding priority, activate up to five lands by tapping them, adding at least
5. Resolve the Shriekwood Devourer trigger, untapping at least five lands
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 ETB
• Infinite combat phases
• Infinite mana lands you control can produce
• Infinite creature tokens with haste
• Infinite untap of lands you control