They wanted to ensure it would heal an adequate amount to be useful yet not heal too much, otherwise a player could make a board full of indestructible Venusaurs
Myriad like on Blade of Selves and mobilize both give you creature tokens that you're supposed to get rid of at your end step, but with no end step, you keep them
Groudon ex's second move is called Crushing Mantle and for 3 energy cards, 2 fighting and 1 colorless energy card it does 50+ hp damage which is the same as Kyogre
Primal Vigor Primal Vigor is a symmetrical effect as both a +1/+1 counter doubler and a token doubler
They go to get it authenticated or graded and it doesnt come back right
However, it's now seeing tons of play in a different archetype - in Defender decks led by Felothar, the Steadfast or Betor, Kin to All