Yedora, Grave Gardener + Granite Witness + Skirk Alarmist + Phyrexian Altar

Yedora, Grave Gardener

Granite Witness

Skirk Alarmist

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Granite Witness, adding one mana of any color.
2. When Granite Witness dies, Yedora triggers, returning Granite Witness from your graveyard to the battlefield face-down as a Forest land.
3. Activate Granite Witness by tapping it, adding .
4. Activate Skirk Alarmist by tapping it, turning Granite Witness face-up.
5. Granite Witness triggers, untapping Skirk Alarmist.
6. Repeat.

This ingenious loop transforms Granite Witness into an endless engine for infinite colored mana, death triggers, and landfall. When you sacrifice Granite Witness to Phyrexian Altar, Yedora, Grave Gardener immediately resurrects it onto the battlefield as a face-down Forest land—which can then tap for green mana before you employ Skirk Alarmist to flip it back face up. Because Granite Witness's own triggered ability untaps Skirk Alarmist in the process, you are left free to repeat the entire sequence indefinitely.