Assassins Trophy gives you so much game against the field that your sideboard is free to attack your expected metagame, not just get you to a passable 60 in most matchups
The card very much captures the spirit of the Rebel Alliance being stronger by working together against the empire
In 2011, Chas Andres published a story called Pack to Power on ChannelFireball inspired by this, talking about how he opened up a pack of Zendikar and traded his way up to a Mox Sapphire
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Id be down to play it in a rampy GU deck, particularly if I had a lot of other defensive cards and removal so I had time to durdle