You have to tribute Blue-Eyes Ultimate Dragon to summon Blue-Eyes Shining Dragon - but the Ultimate Dragon wasn't released until almost two years after the Shining Dragons's first printing, meaning this iconic dragon was completely unusable
If you have a good spread of things and few do nothing or situational cards then Scroll will typically do enough work to be a good inclusion
Rental Decks are prebuilt sets with a limited number of uses that can be earned by completing deck missions, which is a nice pre-fab way to jump in with a particularly-themed collection
Colors in this card are used less for the sake of visual storytelling and more artistically: blending in and out as the composition needs
Plus we've got Buried Alive to yoink Anger, Wonder, and a great reanimate target for example
Mantyke evolves into Mantine when leveled up with a Remoraid in the party, adding an intriguing mechanic to its evolutionary path that ties directly into its habitat and ecological narrative