Being situationalthat is, requiring your opponent to have an artifact worth killingis an inherent weakness of artifact removal, which is why flexible removal that hits multiple card types gets valued highly
Boasting greater power than ever before, the Legendary Zygarde surprises the world by becoming a Mega Evolution Pokmon ex
They're a bit of a Jack-of-all-trades, slotting into decks that care about Zombies, Knights, tokens, or some combination of the three
For example, if you wanted to play Mythos of Nethroi in your deck at the cost of foregoing the extra effect, you wouldnt be able to use it
You can force them to use their mana in their turn
You can run any number of basic lands