Thats not the case for the Foil Simba King in the Making, whose ability works every time a card is put underneath him
Primevals Glorious Rebirth has a lot of asks tied to it, but it does recur an arbitrary number of creatures

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Two mana outlay with essentially a free card thereafter is really good
Also, one of the safe and working tests will be checking the weight of the card
I'm guessing that Obosh will get more play in mono-red than RB, but mono-red is a deck that REALLY wants to curve out