This is because they stop your opponent from playing the cards they need to get to full power
Just remember that whichever mode you choose to cast becomes the mana value of the card on the stack and on the battlefield, unlike other, similar built-in cost reduction mechanics like Suspend or Miracle, s o a commander like Yuriko, the Tigers Shadow very much likes Prototype cards, while Vial Smasher the Fierce does not
Until next time, live long and prosper
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That obviously makes the card scarce, and sellers have been able to name their price
In order to safely use Shooting Star Dragon, Yusei uses Salvagent, which can revive a Synchro monster with the catch that it's treated as not being a Synchro, meaning that it can't be absorbed by Aporia's monster