The pull odds tell the story: one Master Ball mirror per box, 153 possible cards, meaning you need roughly 153 boxes (~6.3 million / ~$43,000) to statistically expect one Gengar
Those cards will also become Game Changers
I won't call that an easy decision, because it isn't
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Its also worth noting that prowess isnt the only ability that triggers when a noncreature spell is cast
Theres a ton of applications for this: you can elk your own cards once youre done with their effects, you can elk the Food token he makes, and best of all, you can elk your opponents big creatures and artifacts essentially making Oko a persistent answer to that your opponent will need to play around