We've got a long road ahead with the Core Set-like set that is Foundations
There are lots of colorless options, ranging from some of the most powerful cards to old, overcosted rocks that you pay mana into and tap just to draw a card
Mill is also not a big part of the current metagame, so its safe to say that this Oops, All Spells/Battle of Wits deck got a lucky break here
Game of Thrones We-ell, the first trigger related to the Monarch designation is rather useful, but the second one seems to turn you into a living target
Again, this poses interesting gameplay from both sides, as the player with the Charm has to think whether holding it to try to steal a one-mana permanent in the future is worth it, while the opposing player has to make decisions to play around it e.g
Notably excluding enchantments and planeswalkers from its destruction, decks that are focused on these strategies rarely have trouble closing a game once it exiles everything else, as everyone else is topdecking with few or no resources on hand