Even if the opponent has Leyline of the Void or Rest in Peace that you dont have another answer for, Oko can turn your one- and zero-power creatures into 3/3s, giving your backdoor plan of attacking with horrible creatures some real teeth, especially against an opponent who maybe took too many mulligans to find a hate card
You could justify buying this for the reprint value alone, or if you just want to scrap it for playables for other decks
How would you build Animar
Instead, I'll post them in "deck list" form so you can easily see their current prices
Getting up to three treasures from Olivia, you just need another treasure producer creature, or doublestrike, and you can get the five you need
Extraplanar Lens Extraplanar Lens is a pretty unique card, and it can provide a lot of ramp in even non-green decks