It was first introduced in 2010's Scars of Mirrodin MTG set, and its card list expanded further in releases like War of the Spark, Modern Horizons, and Phyrexia: All Will Be One
Since 1991, PSA has examined and certified over 57 million collectibles with a combined value of over $6 billion
One possible side effect: might become more prominent if Metagross- GX does decline, because there arent many other Metal-type decks to attack Alolan Ninetales- GX s Weakness
It stops your opponent from playing spells with even CMCs, and if they control any creatures with even CMCs, then they can't block (and your opponent wouldn't be able to play any more of them anyway)
That kind of instant-speed protection from a land slot is hard to come by and makes this card a great piece of tech, especially for Commander players
meaning they're virtually perfect cards