Japanese Pokmon cards are a particular highlight here
While aesthetic profiles focus on what appeals to the player from a product perspective, player types care about what they actively do in each game they play
You may cast that card without paying its mana cost if the resulting spell's mana value is less than or equal to N
The fact that it kills basically everything, including Tarmogoyf, is a huge bonus
Its just not fun to win that way
Turn over turn, Weeping Angel will suffer from the drawback of the opponent being able to turn it off as a blocker by casting creature spells, but this wont always be an option, and through discard or counterspells, there are tools for Dimir decks to save Weeping Angel from opposing removal, all while being able to attack the opponent or their planeswalkers with a vigilant creature that is quite unpleasant to block