The black and blue colour scheme made it visually distinct from normal Charizard
As for my choices on what to remove, I'd focus on things that I'm less likely to pull/Summon (which is why I ditched Mjollnir over, say, Battle-Scarred)
The first two chapters of this card are fine, but the end state is all about getting that big Dragon that not only smashes face but gives you the opportunity to make incoming creatures bigger
It has 280 HP, so it can take heavy hits before going down
The other method involves using sites like Manatraders or Cardhoarder and following their guidelines for selling MTGO cards
[7] Examples include things like: If you target Logans Sun Titan with your Pacifism, we can take him out next turn if we both attack. If you wait to cast your sweeper for a turn I can take out Nancys Liliana of the Veil, which benefits both of us. You cast a Councils Judgement and say, Lets all agree to target Nickys Ghostly Prison so we can stop getting taxed, okay? Sometimes, you just want to do something cool