According to current penalty guidelines, this is a deck/decklist problem, which means you would have to replace the fake with a legal copy of that card (or basic land) and incur a game loss
Eye of Ugin Lands that tap for multiple mana are often busted, but Eye of Ugin takes this further by providing cost reduction that multiple Eldrazi spells can take advantage of
Example: An ability reads, All artifacts are 1/1 artifact creatures. If a permanent is both an artifact and an enchantment, it will become an artifact enchantment creature. Rule 205.1b., for instance, explains that if you animate an artifact using Tezzeret, Agent of Bolass second ability, it will retain all of its prior sypertypes, types and subtypes
I am making the case that if you need a way to discard cards, spellshapers are reusable and very potent