Umbral Mantle + Xenic Poltergeist Combos

2 known combos featuring both cards in Commander

Infinitely large creature until end of turn

Combo 1 with Thran Dynamo

Also requires: Thran Dynamo Thran Dynamo
Results: Infinitely large creature until end of turn
Steps
  1. Activate Xenic Poltergeist by tapping it, targeting Thran Dynamo.
  2. Activate Umbral Mantle's equip ability by paying {0}, attaching it to the Thran Dynamo.
  3. Activate Thran Dynamo by tapping it, adding {C}{C}{C}.
  4. Activate Umbral Mantle by paying {3} and untapping it, giving itself +2/+2 until end of turn.
  5. Repeat.

Combo 2 with Gilded Lotus

Also requires: Gilded Lotus Gilded Lotus
Results: Infinitely large creature until end of turn
Show steps
  1. Activate Xenic Poltergeist by tapping it, targeting Gilded Lotus.
  2. Activate Umbral Mantle's equip ability by paying {0}, 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 {3} and untapping it, giving itself +2/+2 until end of turn.
  5. Repeat.
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