The owner of this deck hasn't added a sideboard, they probably should...
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Three card combo: Horizon Chimera, Archangel of Thune, Fathom Mage.Horizon Chimera triggering life gain, which triggers Archangel of Thune to put a +1/+1 counter on every creature triggering Fathom Mage card draw and the loop continues until you want it to stop.
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