A PSA 10 graded version reportedly sold for around $16.49 million, making it the most expensive Pokemon card in the world
Not only is this card one of the oldest of this kind of advantage, but it's definitely still a card that sees play today, as its power level is very apparent especially when used in conjunction with incidental life gain cards (paired with Uro, Titan of Nature's Wrath, another piece of Green/X card advantage)
That means if you cant usefully keyword the card because you cant really make a lot of interesting cards with it, you have to use the space you have, and make decisions about what makes the card the best thing for the purpose you have
Then, creatures with -1/-1 counters on them cant block
Baylen can turn your tokens into near endless mana, buff himself up to deal lethal damage, and draw you as many additional cards as you need
The prices of some cards may stabilizefor example, The Meathook Massacre barely saw a price dip after its banning, and I doubt the New Capenna Triomes will lose their value for long since so many Eternal formats want thembut others will drop and stay down once they lose relevance