According to TCGplayer, Elven Rings are currently selling for somewhere between $6-700 , Dwarven Rings sell for about $250 , and Human Rings are selling for around $200
And with enough counters, the creature gets new stats and abilities, noted in those little "LEVEL 3-7", "LEVEL 8+" boxes on the card ( in the case of Hexdrinker, with the top end granting you the legendary Progenitus effect of Protection from Everything
But it introduced some staple mechanics and concepts to Magic players, setting the scene for design space still to come
It generates energy counters equal to the number of nonbasic lands an opponent controls when it comes into play, and then allows you to spend four energy to destroy a nonbasic land and make nonflying creatures unable to block each time it attacks
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But its poor when cast fairly, and still costs (in a roundabout way) when used correctly