I've played against versions of the deck that are entirely interaction, relying on Xanathar's theft to dig towards a win condition
All Printings 12 Format Legality 12
But I'm going to pick Emrakul since the Flying Spaghetti Monster is the only one that is still regularly winning games today, although, at the time, Jace, the Mind Sculptor would have been an easy pick
I also put a second Olivia, Mobilized for War in the sideboard, for opponents who aren't playing Lightning Bolt, but it's possible that we'd rather have a Kalitas, Traitor of Ghet instead, for the decks that do
The combination of two Floodborn characters, Fairy Godmother, Mystic Armorer, and Madam Mim, Rival of Merlin, creates a powerful synergy that will allow you to rush out cards with +3 Strength and run them into your opponent's board, then return them to your hand to be played again
Kaldheim is a plane heavily inspired by Norse mythology