The first example we saw was Barbarian Class, which is a one-mana Red enchantment that effectively gives you advantage on your dice rolls, so you can roll two dice and then pick the higher of the two
The "Textless Cosmic Foil" variant of The Mind Stone from the Marvel Super Heroes set has an estimated pull rate of less than 1% in Collector Boosters
You dont want to miss out on going wide whatsoever
Ante cards need to work the same way, by not winning the game for you, but instead setting your other cards up to win
Flipping both sides of the board face-down is highly versatile it can stop an opponent's attack, keep newly summoned monsters from being used as Extra Deck material, and reuse Flip Effects
But until you understand the proper dimensions of these cards, you may be missing out on all of this value