Generally speaking, there should always be more cost 1 cards than cost 2 cards, more cost 2 cards than cost 3 cards, and so on and so forth
This Sonic the Hedgehog collaboration comes on the heels of Wizards of the Coast teaming up with video game developer Square Enix for an entire collection of cards based on the 16-game Final Fantasy franchise
River Bear River Bear has a reasonable enough mana cost that it can be played earlier in the game, especially in a green deck
In short, if there are eight or more creatures in play - and there usually are in multiplayer Commander games - then this spell only costs one mana
To be clear, Im focused on the Collector Boosters, for two reasons: First, they have never gone back and reprinted Collector Boosters, as far as we know