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
Considering that there are ways to Reveillark this (since its a 2/2) and other shenanigans, you can set up all sorts of infinite combos and reanimation loops with the Guide, generating extra mana, death triggers, and more
In the upper echelons of this past week we've got a super sweet Mono Red Blood Moon deck featuring everyone's favorite Monkey Pirate