Gilded Lotus, Karn's Touch, and Umbral Mantle

Prerequisites

• Gilded Lotus on the battlefield
• Karn's Touch in hand
• Umbral Mantle on the battlefield
• Gilded Lotus does not have summoning sickness
• available

Steps

1. Cast Karn's Touch by paying , targeting Gilded Lotus
2. Activate Umbral Mantle's equip ability by paying , attaching it to the Gilded Lotus
3. Activate Gilded Lotus by tapping it, adding three mana of any one color
4. Activate Umbral Mantle by paying and untapping it, giving itself +2/+2 until end of turn
5. Repeat

Results

• Infinitely large Gilded Lotus until end of turn