To unpack it in simple terms, this Grixis (Red, Blue and Black) creature has the ability to copy instant or sorcery spells that target just one player or permanent and use the new copies so that every player at the table (except you) gets hit instead
Using a microscope or magnifier, you may find out that the original card has a multi-layered print
The D23 promo cards, such as Elsa, Snow Queen, Mickey Mouse, Brave Little Tailor, Captain Hook, and Maleficent, are the most valuable cards in the game and have significant investment potential
Jack-in-the-Mox is a reference to the Mox series of cards, but is otherwise not as interesting other than, again, the usage of dice, which is unconventional for sure but nowhere that funny
Combine this with other powerful cards like Portable Hole, and you have a winning strategy
Loxi: Aside from the obvious Hydra tribal include, I think more effects to help Hardened Scales type decks on a budget would be nice