2 Level 4 "Battlin' Boxer" monsters
If a "Battlin' Boxer" monster(s) you control would be destroyed by battle or by a card effect, you can detach 1 Xyz Material from this card instead of destroying 1 of those monsters. When an Xyz Material(s) is detached from this card: This card gains 800 ATK.
Battlin' Boxer Lead Yoke is a FIRE Rank 4 Warrior requiring Battlin' Boxers as materials. With 2200 ATK, it can detach an Xyz Material to protect a Battlin' Boxer(s) from being destroyed. And, if it ditches an Xyz Material, it gains a nice 800 ATK boost.
Lead Yoke's a member of the new Battlin' Boxer archetype which, while new, it does have some pretty good support. Switchhitter will provide the other Battlin' Boxer for an Xyz Summon, meaning Lead Yoke is only one card away. At the cost of your Battle Phase, Sparrer will also provide himself as another Material. Counterpunch will let him become more powerful if, somehow, he ends up against a monster too powerful for him.
Being a Warrior, Lead Yoke has a few uses with cards like the Noble Arms Equips and Warrior Returning Alive. Being FIRE, he can be used as fuel for Blaster, Dragon Ruler once he throws in the towel.
Lead Yoke's the main practical hitter for the Battlin' Boxer deck. Being an easily summonable beatstick with protection for the entire archetype, he surpasses Zenmaines in protection and Gachi in ATK boost. The card's the win condition of the deck, essentially, being able to defend and fight back against most threats.
Since it's Battlin' Boxer exclusive, like the rest of the archetype, the Yoke can't really play well with other builds. Though, considering all you need to play him is Switchhitter and Sparrer, and maybe Headgeared, a Battlin' Boxer-variant could fit into other decks. Grave-control FIRE builds, like Lavals, might enjoy the company, and a deck using Pyrorex could easily benefit from it.
Boxer has very little in the way of flaws. Being almost unkillable, his relatively low ATK isn't really a problem at all. Requiring only Battlin' Boxers is a slight weakness, but he performs especially well in that deck.
Being their only 2-mat Xyz, Boxer is uncontested as the go-to card for his archetype.
Getting rid of Boxer can be a problem considering he listens to "Stronger" by Kanye West while he trains. Using cards that won't destroy him are his Achilles heel, so Compulsory and Prison get points here, as does Spellbook of Fate. Effect negation will essentially make him a 2200 wimp, so that can also be taken advantage of.
Lead Yoke is a very powerful card and one that's hard to knock out of the ring. It's certainly a fierce contender once he hits the field, so, even though he may not be in a Tier 1 deck, he's certainly a card you don't want to see in the other corner.
Usability: 10/10, easy to play and easy to protect.
Art: 6/10, not extremely appealing. I mean, he doesn't look much like a boxer.
Meta: 2/3, I think this could be an interesting rogue or Tier 2 boss monster, and it can stand up to Dracossack.