Many owners look down on this, although it happens all of the time
Three-mana planeswalkers arent supposed to invalidate creatures, artifacts, and win conditions all at once, but Oko didnt get that memo
Further Upgrades The first cards I'd pick up to further juice up the deck would be untapped mana-fixing lands: Watery Grave, Shipwreck Marsh, Underground River, Morphic Pool, Darkslick Shores, Polluted Delta, Sunken Ruins, Undercity Sewers, Urborg, Tomb of Yawgmoth and then maybe a couple more Island / Swamp fetches
Considering your deck is set up to generate these each turn, these cards truly do create a ton of tokens
Or maybe it did, depending on your slant
2 Non-foil borderless or extended-art rare of mythic rare cards This can be one of the 43 borderless rares (46.2%) or 17 mythic rares (9.2%, including 5 borderless planeswalkers)