If you play something like Elves, Goblins, Humans, or Merfolk, you can fill your deck with 30 creatures of the right type and never worry about your mana curve because these creatures exist at all reasonable points in the curve, but if you ever play 30 Giants in a deck, then the average converted mana cost will be five and you will lose most games without ever casting a spell
Even MP copies can be had as cheaply as $45, though LP starts to get expensive, jumping up to the $105 range
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There are a few things that this card cant do
This way, you can get the best price for the cards and get rid of several cards at once
It does conveniently beat Ob Nixilis all of the time, and Dark Depths half of the time