English Prints: Offer massive global demand and are highly liquid in the market, but they carry an extremely high counterfeit risk and have more variable factory cuts
The early Pokemon TCG went through a massive boom and Wizards of the Coast printed a ton of the early sets which resulted in a lot of factory issues
We have cards that were heavily played then, although they have seen reduced play since - like Abeyance
Hence the creature cannot be the target of spells and cannot receive damage, use special powers, attack, or defend
Even when it isnt guaranteed to counter every spell, just countering some spells for 1U is very good
Once a players library has been completely exhausted and they are unable to draw from it, that player loses the game