Ulasht, the Hate Seed, Cathars' Crusade, and Mana Echoes

Prerequisites

• Ulasht, the Hate Seed on the battlefield
• Cathars' Crusade on the battlefield
• Mana Echoes on the battlefield
• Ulasht has at least two +1/+1 counters on it
• available

Steps

1. Activate Ulasht by paying and removing a +1/+1 counter from it, creating a 1/1 Saproling creature token
2. When the Saproling enters the battlefield, Cathars' Crusade and Mana Echoes trigger
3. Resolve the Cathars' Crusade trigger, putting a +1/+1 counter on each creature you control
4. Resolve the Mana Echoes trigger, adding for each Saproling you control
5. Repeat

Results

• Infinite colorless mana
• Infinite creature tokens
• Infinite ETB
• Infinite +1/+1 counters