If it weren't for the flavour text portion, it seems like it could be from a real card
You can combo off by targeting the dragon with your own spells, too
[the card types are Artifacts, Battle , Creature, Enchantment, Instant, Land, Planeswalker, Sorcery.] The mechanic was then previously teased in the current expansion of MTG, Phyerixa: All Will Be One, where the lead designer of MTG, Mark Rosewater, that the Battle mechanic will be featured in MOM
The flashback is a little expensive, but 3 mana to create a copy token at instant speed is a good rate
The set is available for preorder now from your local game store, online at retailers like Amazon, and elsewhere Magic: The Gathering products are sold.
Here are a few options: Leave the physical card outside the game and use a labeled substitute card for while the card must remain hidden in your library or face down Sleeve your deck with fully opaque backs like Dragon Shield Matte sleeves