Originally inspired by Magic's 'Un-sets' (absurdist, non-competitive, rule-bending cards intended for a silly, fun time) Secret Lairs like this are more collector's items than they are competition-worthy
These will either fit into one of the four categories (aggro, midrange, control, combo) or combine a mix of them
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
If X is 10 or more, instead shuffle your graveyard into your library, draw X cards, untap up to five lands, and you have no maximum hand size for the rest of the game