The Gitrog Monster, Dakmor Salvage, and Oona's Prowler

Prerequisites

• The Gitrog Monster on the battlefield
• Dakmor Salvage in hand
• Oona's Prowler on the battlefield

Steps

1. Activate Oona's Prowler by discarding Dakmor Salvage
2. The Gitrog Monster's third ability triggers, causing you to mill two cards and return Dakmor Salvage from your graveyard to your hand
3. Resolve the Oona's Prowler ability, giving it -2/-0 until end of turn
4. Repeat

Results

• Infinite self-mill
• Near-infinite self-discard triggers