Ramos, Dragon Engine, Dragonsguard Elite, Blade of Shared Souls, and Mirror Box

Prerequisites

• Ramos, Dragon Engine on the battlefield
• Dragonsguard Elite on the battlefield
• Blade of Shared Souls on the battlefield
• Mirror Box on the battlefield
• At least six +1/+1 counters on Dragonsguard Elite
• available

Steps

1. Activate Dragonsguard Elite by paying , doubling the number of +1/+1 counters on it
2. Activate Blade of Shared Souls's equip ability by paying , attaching it to Dragonsguard Elite
3. Blade of Shared Souls triggers, making Dragonsguard Elite become a copy of Ramos for as long as the equipment is attached to it
4. Activate Dragonsguard Elite using Ramos's ability by removing five +1/+1 counters from it, adding
5. Activate Blade of Shared Souls's equip ability by paying , attaching it to any creature besides Dragonsguard Elite and ending the copy effect
6. Blade of Shared Souls triggers; decline to use its ability
7. Repeat
8. Once there are infinite +1/+1 counters on Dragonsguard Elite, you may repeat the loop from step 2 infinite times, adding infinite mana

Results

• Infinite +1/+1 counters on all creatures you control with a +1/+1 counter
• Infinite colored mana