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These creatures often make combat miserable for your opponent because you could just activate that boast ability to trade your Dragonkin Berserker for a dragon

This makes the combat feel like a back and forth exchange and is a good emulation of the fights from the anime

If not a reskin, I would bet this is the artwork for a board wipe in the set

One of the first rules of Magic was that each player has a maximum hand size of seven cards, and so if a player had more than seven cards by the end of their turn, they would have to discard cards from their hand until they had exactly seven cards at the end of their turn during the cleanup phase

Mimighoul monsters invite players to special summon them under their opponents control, where they flip and wreak havoc before switching sides back to their owner