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Urborg, Tomb of Yawgmoth is a land that does just one thing, turn all lands into play into Swamps, including itself
Niv-Mizzet, Dracogenius plus Niv-Mizzet, the Firemind is already an absurdly good combo if you manage to play both of them
Gargoyles Card Reveal Stone By Day is a drawback mechanic that all Gargoyle characters will have, tying the ability to their daytime stone form in the show: stone by day, warriors by night
Though Arwen doesnt allow you to scry as easily, its in a better color identity and its buffs are more permanent
Similarly, if The Soul Stone is already harnessed and becomes a copy of something else, it stays harnessed, though it's very likely that won't be relevant until that copy effect ends