WotC internally calls it the Thalia problem, so with this example, you might have two of the Dark Ascension art, one of the Innistrad: Crimson Vow , and if you wanted the Multiverse Legends one, you'd only need to craft one new rare wildcard to allow four of that style to grace your decks
It also supports artifact creatures in general, which is helpful since it lets you flesh out the deck easier, but really he's there to make Phyrexian decks function
He also has another effect that stops legendary creature tokens being sacrificed by the legend rule
Star City Games
card from the Maximum Gold: El Dorado set - If your opponent controls more monsters than you do, your opponent cannot activate monster effects or declare an attack
There are easily twice as many permanents on the field in multiplayer games, meaning our draft pool is much larger