Theyre not too expensive, are pretty good quality, and there are a bunch of official art options for you to choose from
The Suicide Shadow style decks, rocking Death's Shadow alongside spells like Become Immense and Temur Battle Rage, are extremely punishing for Infect players who think 15 life is a safe way to go into turn 3, and that lack removal
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
Bladewing is overcosted at 3BBRR for a 4/4 flying body, but its two abilities make up for it and make it a fine Dragon Zombie
The picture is just for referencing,it's not a PSA10