slifer obelisk and ra card sleeves Yu-Gi-Oh! TCG: Slifer, Obelisk, : Toys & Games Made with high Slifer, Obelisk, & Ra Card

Oko is just value by itself

While they are powerful and diverse cards they are unreliable and somewhat inefficient as counterspells

Any creature that attacks in the second combat phase will remain tapped during the third combat phase.

Its pendulum effect will likely never come up, as its monster effect is so much better

They serve a purposethat purpose just doesn't involve showing up in formats like Standard, Modern, or Pioneer

It's also powerful as a fusion summoning support, but the main purpose of using this card is to appoint a Fusion Monster that has a lot of fusion materials to fertilize his GY at an astonishing speed