Emry, Lurker of the Loch, Black Lotus, and Umbral Mantle

Prerequisites

• Emry, Lurker of the Loch on the battlefield
• Black Lotus on the battlefield
• Umbral Mantle on the battlefield
• Emry does not have summoning sickness
• Umbral Mantle attached to Emry

Steps

1. Activate Black Lotus by tapping and sacrificing it, adding three mana of any color
2. Activate Emry by tapping it, allowing you to cast Black Lotus from your graveyard this turn
3. Cast Black Lotus by paying
4. Activate Emry by paying and untapping it, giving it +2/+2 until end of turn
5. Repeat

Results

• Infinitely large Emry until end of turn
• Infinite storm count