Good examples of echo are Mogg War Marshal and Stingscourger, where you have to pay the echo cost to keep the creature one turn after youve cast it
It helps them emotionally, like I mentioned before, it makes me feel appreciated, I think other artist would feel the same way. What compels a person to deface their cards with signatures

The Rise of the Floodborn Amber and Sapphire Deck contains: 1x The Queen Commanding Presence (Foil) 1x Gaston Intellectual Powerhouse (Foil) 2x Bashful Hopeless Romantic 1x Cristopher Robin 2x Doc Leader of the Seven Dwarfs 2x Dopey Always Playful 3x Gaston Baritone Bully 1x Grand Duke Advisor to the King 3x Grumpy Bad-Tempered 2x Happy Good-Natured 2x Lefou Bumbler (First Chapter) 3x Sleepy Nodding Off 3x Sneezy Very Allergic 2x Snow White Lost in the Forest 3x The Queen Regal Monarch 2x Painting the Roses Red 1x Belle Inventive Engineer (First Chapter) 3x Cruella De Vil Fashionable Cruiser 1x Hiram Flaversham Toymaker 2x Judy Hopps Optimistic Officer 3x Owl Logical Lecturer 2x Philoctetes Trainer of Heroes (First Chapter) 3x The Nokk Water Spirit 1x Winnie the Pooh Having a Think 2x Four Dozen Eggs 2x Launch 2x Fang Crossbow 2x Gumbo Pot 3x Pawpsicle The cards marked as First Chapter are from The First Chapter set, all the others are from the Rise of the Floodborn set
Not great
You get two options and both of them are great: either an enormous army of vampires, or a 10,000 power/ 10,000 toughness dinosaur, with trample, that spawns in already attacking one of your opponents