Dualcaster Mage, Dose of Dawnglow, and Hammerhead, Maggia Boss

Prerequisites

• Dualcaster Mage in hand
• Dose of Dawnglow in hand
• Hammerhead, Maggia Boss on the battlefield
• available

Steps

1. Cast Dose of Dawnglow by paying its mana cost
2. Holding priority, cast Dualcaster Mage by paying its mana cost
3. When Dualcaster Mage enters, it triggers, targeting Dose of Dawnglow
4. Holding priority, activate Hammerhead by sacrificing Dualcaster Mage, putting a +1/+1 counter on Hammerhead
5. Resolve the Dualcaster Mage trigger, copying Dose of Dawnglow Resolve the Dose of Dawnglow copy, returning Dualcaster Mage from your graveyard to the battlefield
6. Repeat from step 3

Results

• Infinite +1/+1 counters on a creature
• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite magecraft triggers