That Shadow deck in particular took full advantage of Reanimates other big edge: resurrecting opposing creatures under your control is surprisingly useful, especially if you arent playing an all-in Reanimator strategy and are less likely to have a target in your own yard
The real power of Urza, Lord High Artificer comes from its ability to play the top card of your library and play it for free
It also powered Necropotence decks whether or not they needed any help
Others have resisted the horse invasion, inventing cards like 'Horseocalypse', an artifact that can trivially exile all horses, 'Sparricus the Unhorse', a Kirin that synergizes with non-horse creatures, or 'Ketamine', a joke artefact that certainly works in the horse deck but feels rather against the spirit of the thing
A copy of an X-spell on the stack is a separate spell with the same X value that you paid for the original
The second rule requires players to understand the different types of Ink in Disney Lorcana