As the card starts a 4 loyalty, the ultimate can be triggered immediately
You can help remedy this by practicing with the deck, goldfishing, and generally getting more familiar with how the deck plays and what it wants to accomplish
While there are a lot of factors that go into picking which Magic formats are for you, one of the biggest is price
Prismatic Ending isnt a new player in Modern, but Azorius Control can leverage it to kill almost anything that sneaks by its stack of counterspells
"...fans can expect to see some of their favorite characters in the 99 of each deck..." Last but not least, Commander might be all about your leader, but RPGs are often about your party as a whole, and WOTC wont leave the supporting casts of these games hanging
Perhaps the best thing about Exhaust is how generic it is