Soldevi Adnate, Nim Deathmantle, and Breaching Hippocamp

Prerequisites

• Soldevi Adnate on the battlefield
• Nim Deathmantle on the battlefield
• Breaching Hippocamp on the battlefield
• Soldevi Adnate does not have summoning sickness
• Nim Deathmantle attached to Breaching Hippocamp

Steps

1. Activate Soldevi Adnate by tapping it and sacrificing Breaching Hippocamp, adding an amount of equal to Breaching Hippocamp's mana value
2. When Breaching Hippocamp dies, Nim Deathmantle triggers, causing you to pay to return Breaching Hippocamp from your graveyard to the battlefield, and attach Nim Deathmantle to it
3. When Breaching Hippocamp enters the battlefield, it triggers, untapping Soldevi Adnate
4. Repeat

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers