There are a myriad of reasons, but I'll start with the one I noticed right away: the main culprit is Karametra, God of HarvestsKarametra, God of Harvests
If attacking isn't an option as a win condition because of some reason or another, there's a backup win condition in group slug cards like Impact TremorsImpact Tremors and Warleader's CallWarleader's Call
But if they don't, you've got plenty of ways to sacrifice your own vampires, providing you with a ready army of 4/3 vampire demons
Here comes Secret Lair 's latest collection of your new favorite Magic cards
So this means, to some extent, you can buy: Packs Preoconstructed Decks The way to do this is through Gray Viking Games
If they resolve a Wurmcoil it gets disgusting very quickly short of a few good exile, bounce and tap solutions