Yedora, Grave Gardener, Dragon's Eye Savants, and Phyrexian Altar

Prerequisites

• Yedora, Grave Gardener on the battlefield
• Dragon's Eye Savants on the battlefield
• Phyrexian Altar on the battlefield
• You have at least one blue card in hand

Steps

1. Activate Phyrexian Altar by sacrificing Dragon's Eye Savants, adding one mana of any color
2. When Dragon's Eye Savants dies, Yedora triggers, returning Dragon's Eye Savants to the battlefield face down as a Forest land
3. Activate Dragon's Eye Savants by tapping it, adding
4. Activate Dragon's Eye Savants's morph ability by revealing a blue card from your hand, turning it face up
5. Repeat

Results

• Infinite colored mana
• Infinite death triggers
• Infinite landfall triggers
• Infinite LTB
• Infinite sacrifice triggers