Flavor-wise, theyre supposed to be the actual spells cast by planeswalkers, though some suspension of belief is required
Once a player has chosen not to reveal a companion, that player can't change their mind
White-Blue Artifacts This deck is somewhat self-explanatory as it's primarily a two-color deck centered around artifacts and payoffs for playing artifacts
Now, I should make it clear, your freshly cracked Dragons of Tarkir wrappers are basically worthless
Another key element is that you can give any creature those abilities, even your opponents, making it a tricky card in multiplayer formats
While I dont have the numbers to back it up, Id be shocked if Modern Masters 2013 , 2015 , and 2017 all brought people to the format in droves