Yarus, Roar of the Old Gods
Karlov Watchdog
Altar of Dementia
Harmless Offering

   Prerequisites

What do I need to start this combo?
Harmless Offering in hand.
All other permanents on the battlefield.
You control a face-down creature whose front face is a permanent card. You have enough mana to cast Harmless Offering.

   Steps

How does this combo work?
1
Cast Harmless Offering by paying its mana cost, giving control of Karlov Watchdog to an opponent.
2
During the opponent's turn, activate Altar of Dementia by sacrificing a face-down creature you control.
3
When the creature dies, Yarus's second ability triggers, returning it from your graveyard to the battlefield face-down as a 2/2 creature, and then not turning it face-up due to Karlov Watchdog.
4
Resolve the Altar of Dementia ability.
5
Repeat from step 2.

   Results

What do I get from this combo?
Infinite LTB
Infinite ETB
Infinite sacrifice triggers
Infinite death triggers
Infinite mill
Infinite self-mill
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