Time Sieve, and Ria Ivor, Bane of Bladehold

Prerequisites

• Time Sieve on the battlefield
• Ria Ivor, Bane of Bladehold on the battlefield
• You control a creature that can deal 5 combat damage to players each turn

Steps

1. At the beginning of combat on your turn, Ria Ivor triggers, targeting a creature you control
2. Declare that creature as an attacker
3. Instead of that creature dealing damage to an opponent, instead prevent that damage and create at least five 1/1 Phyrexian Mite artifact creature tokens
4. Activate Time Sieve by tapping it and sacrificing five Phyrexian Mite tokens
5. Repeat each turn

Results

• Infinite turns