What that means exactly varies from creature to creature
However, they seem to have forgotten that ice can melt
2x Flounder, Voice of Reason 2x Goons, Maleficent's Underlings 2x Magic Golden Flower Cost 2 Cards 3x Aurora, Regal Princess 3x Coconut Basket 2x Frying Pan 2x Gramma Tala 2x One Jump Ahead 2x Prince Eric 2x Ransack Cost 3 Cards 2x Hercules, True Hero 2x Jasmine, Disguised 2x Kristoff, Official Ice Master 3x Mickey Mouse, Detective 2x Smash Cost 4 Cards 3x Aurora, Briar Rose 3x Maleficent, Sinister Visitor Cost 5 Cards 1x Aurora, Dreaming Guardian 2x Beast, Hardheaded 1x Grab Your Sword 1x Maleficent, Uninvited 2x Simba, Rightful Heir Cost 6 Cards 2x Mufasa, King of the Pride Lands 1x Scar, Mastermind Cost 7 Cards 1x Simba, Returned King Cost 8 Cards 1x Maui, Demigod What Do These Cards Do
5 Raiders' Spoils Small Power Bump, Big Card Draw Potential +1/+0 is significantly below the bar for a four-mana anthem effect, but the opportunity for some mass card draw makes up for that
Now it's significantly larger and known
Laboratory Maniac With a shout out to Jace, Wielder of Mysteries