Many pro-creature cards aren't creatures to give your deck tension, but not this
While that gives the set a cool thing to market, it makes it hard to design
Brotherhood of the Fire Fist - Boar X FIRE Level 4 [ Beast-WarriorTunerEffect ] ATK 1100 DEF 1400 Cannot be used as a Synchro Material Monster, except for the Synchro Summon of a FIRE monster
This can also make a format quickly become stale
The only question that players have had is, How big will this get? The good news is that eagle-eyed players, such as those at The Gamer, have noted that one of the achievements in Pokemon TCG Pocket reveals how big it could get
Luckily, Rank 4 XYZ monsters are not difficult for the Machine-type to make because the strategies have nearly endless extenders and consistency tools that make this process easy