It may even be better in the 99, since there are many more combo options outside of mono-black
There are other cards in MTGs history, like Door to Nothingness, which will make another player lose the game, but these cards wont be covered here
Creatures (37) 4 Chief of the Edge 4 Bloodsoaked Champion 4 Mardu Shadowspear 4 Mardu Woe-Reaper 3 Arashin Foremost 4 Dragon Hunter 3 Kytheon, Hero of Akros 3 Thraben Inspector 4 Thalia's Lieutenant 4 Venerated Loxodon Lands (20) Spells (3) Sideboard The main reasons to reach to full Mardu or Abzan Warriors just dont align with the Humans payoffs, so two-color it is
Blossoming Tortoise Eliana: This card already fits nicely into a lot of Golgari and Abzan lands archetypes well, but the coolest line of text in my opinion is after the first more lengthy paragraph
Based on this, it seems like Snapcaster Mage is intended to be the Bonus card for the Winter drop, and just so happened to end up in the Spring one instead