Body Launderer, Felidar Guardian, Mikaeus, the Unhallowed, and Phyrexian Altar

Prerequisites

• Body Launderer on the battlefield
• Felidar Guardian on the battlefield
• Mikaeus, the Unhallowed on the battlefield
• Phyrexian Altar on the battlefield
• Felidar Guardian does not have a +1/+1 counter on it

Steps

1. Activate Phyrexian Altar by sacrificing Felidar Guardian, adding one mana of any color
2. When Felidar Guardian dies, its undying ability and Body Launderer's first ability trigger
3. Resolve the Body Launderer trigger, causing it to connive
4. Resolve the Felidar Guardian trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
5. When Felidar Guardian enters the battlefield, it triggers, targeting Body Launderer
6. Holding priority, activate Phyrexian Altar by sacrificing Felidar Guardian, adding one mana of any color
7. When Felidar Guardian dies, Body Launderer's first ability triggers, causing it to connive
8. Resolve the Felidar Guardian trigger from step 5, blinking Body Launderer
9. Activate Phyrexian Altar by sacrificing Body Launderer, adding one mana of any color
10. When Body Launderer dies, its undying and second ability triggers
11. Resolve the undying trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it
12. Resolve the second Body Launderer trigger, returning Felidar Guardian from your graveyard to the battlefield
13. When Felidar Guardian enters the battlefield, it triggers, blinking any other permanent you control
14. Repeat

Results

• Infinite card draw
• Infinite draw triggers
• Infinite looting
• Near-infinite blinking of permanents you control
• Near-infinite colored mana
• Near-infinite death triggers
• Near-infinite ETB
• Near-infinite LTB
• Near-infinite sacrifice triggers