These decks tend to run just 1-2 copies of the card
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
Oftentimes, these can be great decks to use and improve on as you learn more about the game, such as the My First Battle Starter Sets
This process tends to thicken the card, as it's quite difficult to split a card exactly in half
To me, however, I think Glaceon will hold up better overtime