Colfenor, the Last Yew
Ashnod's Altar
Phyrexian Marauder
Stonecoil Serpent

   Prerequisites

What do I need to start this combo?
Stonecoil Serpent in your graveyard.
All other permanents on the battlefield.
At least one +1/+1 counter on Phyrexian Marauder.

   Steps

How does this combo work?
1
Sacrifice Phyrexian Marauder to Ashnod's Altar for .
2
Colfenor triggers, returning Stonecoil Serpent from your graveyard to your hand.
3
Cast Stonecoil Serpent for 1.
4
Sacrifice Stonecoil Serpent to Ashnod's Altar for .
5
Colfenor triggers, returning Phyrexian Marauder from your graveyard to your hand.
6
Cast Phyrexian Marauder for 1.
7
Repeat.

   Results

What do I get from this combo?
Infinite colorless mana
Infinite ETB
Infinite LTB
Infinite death triggers
Infinite sacrifice triggers
Infinite storm count
Colfenor, the Last Yew
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