You have so many good cards to play in decks with Yorion that you can play it pod style, where you tutor out for whatever card you need for the given gamestate
X counterspells scale as the game goes on, allowing them to remain relevant, and this one even exiles it's target
This card is so good that it's sure to see more play in Standard before it rotates, so keep an eye out for it there as well
Mason allows us to do whatever we want until we want to execute an action that will end the turn
You may be thinking, how does Gilgamesh, Master-at-Arms's performance in Sealed have anything to do with Commander
Similarly, if Lightning leaves the battlefield and later returns, you won't be able to play the cards that were exiled the first time it was on the battlefield since it's a new object