Death's Oasis, Deathrender, Elderfang Ritualist, and Carrion Feeder

Prerequisites

• Death's Oasis on the battlefield
• Deathrender on the battlefield
• Elderfang Ritualist on the battlefield
• Carrion Feeder on the battlefield
• You have an Elf creature card in your graveyard with mana value four or greater

Steps

1. Activate Carrion Feeder by sacrificing Elderfang Ritualist
2. When Elderfang Ritualist dies, it, Deathrender and Death's Oasis triggers
3. Resolve the Elderfang Ritualist trigger, returning an Elf creature card with mana value four or greater from your graveyard to your hand
4. Resolve the Deathrender trigger, putting the Elf with mana value four or greater from your hand onto the battlefield, and attaching Deathrender to it
5. Resolve the Death's Oasis trigger, causing you to mill two cards and return a creature card with mana value two or less from your graveyard to your hand
6. Activate Carrion Feeder by sacrificing the creature with Deathrender attached
7. When the creature dies, Deathrender and Death's Oasis triggers
8. Resolve the Death's Oasis trigger, causing you to mill two cards and return Elderfang Ritualist from your graveyard to your hand
9. Resolve the Deathrender trigger, putting Elderfang Ritualist from your hand onto the battlefield, and attaching Deathrender to it
10. Resolve both Carrion Feeder abilities from steps 1 and 6, putting two +1/+1 counters on it
11. Repeat

Results

• Infinite +1/+1 counters on Carrion Feeder
• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers