Each has a Continuous Effect to be unaffected by your opponents activated effects, unless they target the card, each has an effect when Special Summoned, and each has an effect associated to a prior iteration of the monster for BLS, it borrows the ability to attack again with 1500 extra ATK after destroying a monster by battle, and for BCDCM, it borrows the effect of Chaos Scepter Blast to banish an opponents card face-down
Brawly #84 (Pokemon Japanese Matchless Fighter | Pokemon Cards) prices are based on the historic sales
Since your opponents likely wont have too many heavy-hitters, removing a single high-value creature can win you the game
This just doesnt look worth it at all, so avoid at all costs
Extra creatures can also have a wide range of benefits depending on the type of deck youre playing
this most often comes from combat, but few people who have been on the bad side of a Lightning Bolt or Grapeshot would dispute their value