Dualcaster Mage, Bloodthrone Vampire, and Behold the Sinister Six!

Prerequisites

• Dualcaster Mage in hand
• Bloodthrone Vampire on the battlefield
• Behold the Sinister Six! in hand
• available

Steps

1. Cast Behold the Sinister Six! by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Behold the Sinister Six!
4. Holding priority, activate Bloodthrone Vampire by sacrificing Dualcaster Mage, giving Bloodthrone Vampire +2/+2 until end of turn
5. Resolve the Dualcaster Mage trigger, copying Behold the Sinister Six! Resolve the Behold the Sinister Six! copy, returning Dualcaster Mage from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers
• Infinite recursion of creature cards in your graveyard
• Infinitely large creature until end of turn