EDHREC data shows that Oko sees the most play in legends-matters decks like Sisay, Weatherlight CaptainSisay, Weatherlight Captain or planeswalker-matters decks built around cards like Nicol Bolas, Dragon-GodNicol Bolas, Dragon-God and Oath of TeferiOath of Teferi
It can even triple squirrel tokens
Creating an X/X flying Spirit based on unlocked doors has potential, but it's a slow build
Showcase rares or mythic rares, including mutate cards and the showcase lands, are in approximately 1 in every 1415 packs

31%inclusion 1.6lift 3.48K decks 11.3K decks Wrong Turn 30%inclusion 1.8lift 4.52K decks 14.9K decks Beast Within 29%inclusion 0.1lift 2.60K decks 8.84K decks Fog 28%inclusion 1.0lift 2.50K decks 8.84K decks Arcane Denial 28%inclusion 0.3lift 4.12K decks 14.9K decks Lethal Scheme 24%inclusion 1.1lift 2.74K decks 11.3K decks Sudden Substitution 22%inclusion 1.7lift 3.27K decks 14.9K decks An Offer You Can't Refuse 21%inclusion -0.0lift 3.07K decks 14.9K decks Wear // Tear 21%inclusion 0.5lift 5.56K decks 27.1K decks Reins of Power 20%inclusion 1.4lift 2.96K decks 14.9K decks Dovin's Veto 20%inclusion 0.0lift 2.92K decks 14.9K decks Heroic Intervention 19%inclusion -0.2lift 1.66K decks 8.84K decks Boros Charm 17%inclusion -0.1lift 4.61K decks 27.1K decks Stroke of Midnight 16%inclusion 0.2lift 6.22K decks 39.7K decks Deflecting Palm 15%inclusion 0.4lift 4.04K decks 27.1K decks Inkshield 14%inclusion 0.3lift 1.62K decks 11.3K decks Negate 13%inclusion -0.0lift 1.93K decks 14.9K decks Secure the Wastes 13%inclusion 0.7lift 5.05K decks 39.7K decks Dawn's Truce 13%inclusion 0.3lift 4.99K decks 39.7K decks Sail into the West 12%inclusion 1.4lift 611 decks 5.03K decks Take the Bait 12%inclusion 0.7lift 3.27K decks 27.1K decks Everybody Lives

That would be a more appropriate threat to expect in a (much) higher power level