They have fewer hoops to jump, they fit into the Attack, yarrr! theme that pirates have by keeping our boys comin', and some pirates have very good enter-the-battlefield effects that Brass lets us reuse
It only gets worse in multiples too
Its a critique I have heard about myself more than once, so dont bother commenting because I already know what youre thinking
You can buy Art Series cards from online retailers and marketplaces like TCGplayer, and your local game store may stock them
As part of their explanation, Bandai mentions that any card from a forbidden block group can return to legal status should said card be reprinted in a newer set with a new block number
Last Chance + Warriors Oath Last Chance and Warrior's Oath are best in combo-centric decks that can win on their extra turn or decks packing Stifle and Sundial of the Infinite