If Ugins Labyrinth is indeed S tier, it will likely be in conjunction with Devourer of Destiny to get up to enough playable 7 drops to consistently get 2 mana off the Labyrinth
I run one in my Commander Cube and it's amazing there even with just three other Snow cards in more than 1,000 cards (Dark Depths, Adarkar Valkyrie, and Ohran Viper)
At the beginning of your upkeep, draw a card
Although most of the typal cards from 2008 come from Morningtide , my pick for 2008 is actually from Shadowmoor : Shadowmoor (though two would later retroactively gain it)
Then, we can cast (or reanimate) Loaming Shaman to shuffle 20-ish creatures from our graveyard into our library and win the game on the spot with Syr Konrad, the Grim damage
My basic take at the time is that Legacy is an ocean of piss, into which pissing does not dilute much at all, and I say that as someone who likes Legacy