This video is unplanned so I apologize if it doesn't look similar to my other videos. I was walking to my Bus Stop and did a pull (with my usual meta), and voila, Key Art #4 showed up! I was so happy because I really love the art work on this! :)
The reason why I put in Ability Prize & Attack Up on this medal is because it is cheap to use, and would be always used whenever you want to buff your deck.
As what I have mentioned in my previous video, Key Art #4 should be good if you don't have a Terra. The argument I want to raise to all of you is: Would you rather be able to reach +3 M Atk (Terra + Ja k & Sally) or only reach +2 M Atk (Key Art #4 + Jack & Sally). Basically, Key Art #4 is a really good replacement for Terra in raids, but Terra can still perform good on those instances. For coliseum though, I would rather use Terra due to his capability of reaching +3 M Atk. :)