they really are Speed Duels
Illustrated by Alex Horley-Orlandelli Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
So much so, in fact we actually did an entire article about it
These cards, along with Snorlax, do a great job of illustrating the Go experience the experience we have in our heads as we play, that grabbed millions of people in 2016, and that makes us feel like IRL Pokemon trainers to this day
However, it is an excellent card to call out with Ties of the Brethren, and if you are surviving the opponent's turn with D-HERO Dreadmaster, you can send Absolute King Back Jack to the Graveyard from the summon, so I judged that there is no problem in including it
Pick them highly in Draft, and give them a try in Constructed