The card is so powerful that it's often played in Control decks in the Legacy format
Fatal Push When Fatal Push showed up in Aether Revolt it didn't quite break the color pie (destroying enemy creatures is one of black's areas of expertise), but the number of targets it removed for just 1 mana was previously unheard of
Its a nice way to make a kind of Eldrazified equipment, especially as I cant imagine Ulamog picking up a sword (okay, maybe I can imagine that, and as awesome as it would be, it wouldnt really fit with the aesthetic)
It's a smart pick for early-game tempo and mid-game card flow
The Fourth Doctor The Fourth Doctor provides card advantage by letting you see and play cards from the top of your library
This teaches new players just how impactful a good Commander can be, and gets them to think much more about when to play their Commander for max value and how Commander tax works once they've been removed