Trudge Garden, Mana Echoes, and Verdant Sun's Avatar

Prerequisites

• Trudge Garden on the battlefield
• Mana Echoes on the battlefield
• Verdant Sun's Avatar on the battlefield
• You have a way to gain life
• , plus an additional available if you do not control a Fungus or Beast available

Steps

1. Gain any amount of life
2. Trudge Garden triggers, causing you to pay to create a 4/4 Fungus Beast creature token
3. When the Fungus Beast enters the battlefield, Mana Echoes and Verdant Sun's Avatar trigger
4. Resolve the Mana Echoes trigger, adding for each Fungus and/or Beast you control
5. Resolve the Verdant Sun's Avatar trigger, causing you to gain life equal to the Fungus Beast's toughness
6. Repeat from step 2

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers