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Miraidon ex : Energy generation and instant attacks make Miraidon a major force in the meta

He could use the effect of his White Arbitration still in play to change Clay Breaker into Defense Position, but Yuya still has Speedroid Marble Machine in his Pendulum Zone, whose effect would allow him to change Clay Breaker back to Attack Position, and prevent its destruction for the rest of the turn

You can even easily kill a Commander player with their starting life total of 40 with aplomb

once, if you Fusion Summon a Machine Fusion Monster this turn, you can banish monsters from your hand, field, and/or GY as the Fusion Materials

For some decks thats almost impossible, but then those are the sorts of decks that probably want to discard that extra card anyway

The human time lord can also scale in power when an opponent Scries, searches their library, or Surveils