You cant actually cast spells until your next turn if you choose to do it
What sucks here is that this is clearly a Commander-only card, in that its dead in the water in any other format but is significantly worse
Another major issue for Pokemon TCG fans is that these cards erode trust, as while these are more obviously fake to a discerning fan, there are big problems with more official looking cards having fake versions being sold around as well
It's not immensely, but it's advantageous to hide cards like this in your manabase without sacrificing the consistency of your land drops
Having that much negate power in a single card (which can also steamroll your opponent at the same time) will win you so many games.
Mount Doom, a red-black land that hurts you when it makes mana, can also hurt your opponents and act as a board wipe if you sacrifice it and a legendary artifact (like The Ring)