guardian cards yugioh PHNI-AE103 Gate of Wind and Water (SR) – TCG Corner This is of Ultra Rare rarity Guardian Kay'est - Yugipedia

As such this just falls into the camp of being bad compared to cheaper cards that do the same or better without learn

If luck werent a factor, I would win every time, claims Hellmuth

To fill out the rest of your deck, there are also four 10-card booster packs from the Sword & ShieldDarkness Ablaze expansion

It is impossible think to defeat the opponent just using "mill sources", you have to think to some alternatives: you can do that with a lot of order, and you must not need luck in order to win , every hand should be the ideal hand

Or, perhaps Wizards decided they dont want to keep using the mechanic for whatever reason