Primus is a great value card but value is not the thing when you pass the six mana point
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The effect of the hand cost is a draw, and if you use this card as a cost in the middle of leveling up, there is a risk that the cost for leveling up will be interrupted, so basically when you raise LV7 to LV10, you want to use it as a cost
Oko is in the same color combination as Hydroid Krasis, a card which excels in ramp decks, paying you off with more cards, more life, and a huge flying, trampling body
Even in the environment Deck, it is used in Tri-Brigade (for activating the Schlaig effect) in the early implementation and Zoodiac before the ban on Drancia (Because it can be Xyz with one lower grade, it is used to prepare materials without consuming the right to summon)
While working on Return to Ravnica design, I came up with the populate mechanic