Birgi, God of Storytelling // Harnfel, Horn of Bounty + Dualcaster Mage + Snap

Prerequisites

• You control at least two lands, with at least one of them able to tap for red.

Steps

1. 1Cast Snap.
2. 2Birgi triggers, adding .
3. 3Holding priority, cast Dualcaster Mage.
4. 4Birgi triggers, adding .
5. 5Dualcaster Mage enters the battlefield, copying Snap, with the copy targeting Dualcaster Mage.
6. 6Resolve the copy of Snap, returning Dualcaster Mage to your hand and untapping the two lands.
7. 7Holding priority, tap those 2 lands for .
8. 8Repeat steps 3-7.

Effects

• Infinite ETB
• Infinite LTB
• Infinite magecraft triggers
• Infinite mana lands you control can produce
• Infinite storm count
• Infinite untap of lands you control