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9 Primeval Protector Primeval Protector very often costs a single green mana for a 10/10 that spreads +1/+1 counters across your creatures

It offers something for everyone, from beginner to advanced players

But when an extra 3 mana only meant you could get your Force of Nature ($3,500) out on turn 4 instead of turn 6, that really wasnt that big of a deal

Note that it doesn't say, "X or less" so you can't put 10 mana into X and the bounce a 1-drop and make 10 dorks

Cards from The List are legal in those formats in which they are normally legal

It's just one mana to add an additional +1/+1 counter on your creatures