Brewing UR Improvise I started in blue-red because they're the colors I like to play, and the most appealing improvise cards were blue or red (barring Herald of Anguish, but more on him later)
This is, in part, because Maze's End is a solid (and extremely budget friendly) Pioneer deck and in part because among a huge number of Commander Legends : Battle for Baldur's Gate leaks, there have been some cards (including new legends) which care about the Gate land type
That can be useful in some political situations in multiplayer formats if youre wanting to protect an allys stuff, or even to prevent your opponents from targeting their own stuff
Both options are so awesome since Commander and multiplayer are all about not knowing what you'll be against so I love adding in flexible removal like this into my removal suite
Goblin This troublemaker from Commander 2016 is a great piece by Wayne Reynolds
Brago, King Eternal Also in my Commander Cube