Felidar Guardian, Karmic Guide, and Altar of Dementia

Prerequisites

• Felidar Guardian in hand
• Karmic Guide on the battlefield
• Altar of Dementia on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying
2. Felidar Guardian's ability triggers, targeting Karmic Guide
3. In response, activate Altar of Dementia by sacrificing Felidar Guardian, causing target player to mill a card
4. Resolve Feldiar Guardian's trigger, blinking Karmic Guide
5. Karmic Guide triggers, returning Felidar Guardian from your graveyard to the battlefield
6. Repeat from step 2

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite mill
• Infinite sacrifice triggers
• Infinite self-mill