Najeela, the Blade-Blossom, Jegantha, the Wellspring, and Helm of the Host

Prerequisites

• Najeela, the Blade-Blossom on the battlefield
• Jegantha, the Wellspring on the battlefield
• Helm of the Host on the battlefield
• Helm of the Host attached to Jegantha
• Opponents can not block and kill creatures you control

Steps

1. At the beginning of your combat phase, Helm of the Host triggers, creating a token copy of Jegantha with haste that isn't legendary
2. Activate the Jegantha token by tapping it, adding that cannot be spent to pay generic mana costs
3. Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one
4. Repeat each combat phase

Results

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