Artist takuyoa also decided to pay tribute to Charizard's entire evolution line by including Charmander, Charmleon, and normal Charizard looking up at the magnificence of their own mega evolution
Not background necessarily, but some other line of text that says something along the lines of Whenever you sacrifice a Treasure token, give a creature a +1/+1 counter and trample until end of turn. That would make it a lot more interesting and powerful, but I suppose not every card needs to be great
This would later be addressed, at least in temporary fashion, in Pokmon X/Y where Charizard gained the ability to Mega Evolve into the mighty Mega Charizard X, a Fire and Dragon-type with black scales and blue flame
Athreos's ability allows a player to return creatures to their hand when they die, rather than put them into their graveyard, unless their opponent pays 3 life
Its seeing too much play to stay this cheap
Feather is a mix of Voltron commander and spellslinger commander, and thats because of its unique ability