Like so many of the best Magic cards they are hard to say much about because they are so simple, they have little text and just get a job done at a good price
Grafted Exoskeleton, Phyresis, and Tainted Strike also pair very well with direct damage spells like Chandra's Ignition
It's worth mentioning that while this strategy is effective, it can also be irritating to play against and is only recommended for more competitive formats.
Of course, its not all upside
Losing two cards sucks, especially in a four-player game where youve stopped one other player and the other two are just celebrating, especially since youre almost never using this to protect your own win, but youre playing blue so you dont just lose to a turbo deck with a good draw, and this is what it takes