Mekk-Knights have a bunch of cards to get rid of cards in particular columns (and of course, who could forget Infinite Impermanence?), making this 3000-damage direct attack super easy to pull off
[Edit] My guess is that Jirachi Prisms ability still works, because it states, before you put it in your hand, while Barbaracle is, instead of your hand. If Jirachi Prism heads for the bench, Barbaracle doesnt say instead of the bench, meaning it should go through
Card Set(s) -The Three Captains-[ST-10] CARD VIEW ST10-010 | SR | CHARACTER Trafalgar Law Attribute Slash Block icon 2 Effect [Blocker] (After your opponent declares an attack, you may rest this card to make it the new target of the attack.) [On Play] DON
Getting a cheap equipment as it enters makes your early turns a lot smoother, and trample means that equipment turns into real damage instead of just looking cute on the board
The interaction of these factors in complex ways determines a cards value