Secluded Courtyard Secluded Courtyard is a land
Amazing Acrobatics Beetle, Legacy Criminal Chameleon, Master of Disguise The Clone Saga Doc Ock, Sinister Scientist Doc Ock's Henchmen Flying Octobot Hide on the Ceiling Hydro-Man, Fluid Felon Impostor Syndrome Lady Octopus, Inspired Inventor Madame Web, Clairvoyant Mysterio, Master of Illusion Mysterio's Phantasm Green Goblin Norman Osborn Oscorp Research Team Robotics Mastery School Daze Secret Identity Spider-Byte, Web Warden Spider-Man No More Spider-Sense Unstable Experiment Whoosh
Like most Magic: The Gathering cards, the value of Imaginary Pet depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Urza's Saga)
Before I move on, I want to discuss this anomalous little entry: Deep Gnome Terramancer
Mardu - If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time