Yedora, Grave Gardener
Phyrexian Altar
Dulcet Sirens

   Prerequisites

What do I need to start this combo?
All permanents on the battlefield.

   Steps

How does this combo work?
1
Activate Phyrexian Altar by sacrificing Dulcet Sirens, adding .
2
When Dulcet Sirens dies, Yedora triggers, returning Dulcet Sirens from your graveyard to the battlefield face down as a Forest land.
3
Activate Dulcet Sirens by tapping it, adding .
4
Activate Dulcet Sirens's morph ability by paying , turning it face up.
5
Repeat.

   Results

What do I get from this combo?
Infinite death triggers
Infinite green mana
Infinite landfall triggers
Infinite LTB
Infinite sacrifice triggers
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