Thornbite Staff, Elemental Mastery, and Heartless Summoning

Prerequisites

• Thornbite Staff on the battlefield
• Elemental Mastery on the battlefield
• Heartless Summoning on the battlefield

Steps

1. Activate the creature with Elemental Mastery attached by tapping it, creating at least one 1/1 Elemental creature token with haste
2. The Elemental(s) enter the battlefield and die as a state-based action due to having 0 toughness
3. When the Elemental(s) die, the creature with Thornbite Staff attached triggers that many times, untapping itself
4. Repeat

Results

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