It was introduced in the Alpha set that was released in 1993
I love cards still out there like Preferred Selection, Rainbow Vale, or Bubble Matrix as well
Usually when a planeswalker makes a respectable body for its cost, it leaves you with a planeswalker that has very little remaining loyalty, but with Oko, if you have some trivial artifact around, like an Arcums Astrolabe, it essentially gives you a 3/3 haste creature and a planeswalker with five remaining loyalty on the battlefield
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Kick in the Door: To venture into the dungeon, a player moves their venture marker into the next room of the dungeon they are currently in
And it should be, as Final Fantasy fans favorite little black mage
Without an sorcery like Bitter Ordeal (which can be amazing) I think you're better off trying to stay ahead of your opponents and get those creatures on to the battlefield ASAP rather than worrying too much about graveyard protection