I just think the card is well executed it being an artifact plays well with Urzas Saga, Improvise and Springleaf Drum, and unlike Thalia, Guardian of Thraben where youre locked out by the tax, you have the choice with Esper Sentinel which presents interesting in-game decisions as you have to balance the tax on the mana versus providing your opponent with card advantage a similar decision to that of being on the play or on the draw
Aragorn, King of Gondor makes you the monarch when he enters the battlefield, which plays off the decks sub-theme
If you answer him or never cast him, you'll gain tons of life that you cannot shut down
Its going to end games quickly, and if you ever attack with it, its going to cost your opponent a lot to get rid of it
+1: Add or
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