Underground River bug (no life loss)
My opponent didn't gain any life during the first turns of the match. He manually tapped underground river for colorless mana. He then played Bilious Skulldweller without tapping a second land for black mana. He somehow played the creature without losing life. You can clearly see in the screenshot that he didn't tap a second land, still has 20 life, and Skulldweller still has summoning sickness so he didn't play it in the last round.
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jolle#87126
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