Owning an MST from its original set is definitely a desirable thing for many collectors, as it's likely one of the first spells you think of in Yu-Gi-Oh
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If this Fusion Summoned card you control is sent to your GY by an opponent's card: You can Special Summon 1 "Cyber Dragon" from your hand, Deck, or GY
You now get a bonus where if you banish a DARK with this effect, you can banish all copies of that monster with the same name from the hand, Main Deck, Extra Deck, and graveyard of the player who controlled the banished monster
After Yami Yugi defeats "Guardian Eatos", Rafael calls forth "Guardian Dreadscythe"
This is especially useful if your opponent uses Quick-Play Spell Cards during your turn, as you gain extra advantage with free Fusion Materials for Dracotail , extra Synchro Materials for high-Level Synchro Monsters, or free Link Materials for Decks like Maliss