Well, if you're playing humans in any format where it's legal, it's a good option
Whether Im stealing my opponents giant Dinosaurs and telling them welcome to the crew big guy, youre a mercenary now! Or stealing my partners Vraska, Golgari Queen, activating her ultimate and then knocking them out with one creature (thank you for not leaving me because of that)
If both creatures are controlled by the same player as Run Away Together tries to resolve, both targets are illegal
A player loses the game after having been dealt 21 damage from one of them, not from both of them combined
Blightwing Bandit Flying, deathtouch Whenever you cast your first spell during each opponent's turn, look at the top card of that player's library, then exile it face down