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Well, accruing as much mana as possible is critical in the early game in Commander, and this Raptor certainly aids you on that front

While there are a few cards like this, Gemstone Caverns is the only land that has this trait, and is one of the ways that players can win on the very first turn of the game under admittedly very specific circumstances

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Caller of the Claw and Vile Redeemer are especially well-suited for this deck, because they can be cast at the end of an especially activation-heavy turn to fill our board with tokens

This effect can't reduce the mana in that cost to less than one mana.

They also have some bad interactions with certain spells you might want to play yourself such as Upheaval or Akroma's Vengeance