Osteomancer Adept, Solemnity, Samwise Gamgee, and Phyrexian Altar

Prerequisites

• Osteomancer Adept on the battlefield
• Solemnity on the battlefield
• Samwise Gamgee on the battlefield
• Phyrexian Altar on the battlefield

Steps

1. Activate Osteomancer Adept by tapping it, allowing you to cast creature spells from your graveyard this turn by foraging in addition to the spell's other costs
2. Cast the creature card that can be cast using one colored mana from your graveyard by paying its mana cost and sacrificing a Food
3. When the creature enters the battlefield, Samwise triggers, creating a Food token
4. Activate Phyrexian Altar by sacrificing the creature, adding one mana of any color
5. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB
• Infinite sacrifice triggers
• Infinite death triggers
• Infinite storm count