Even beyond the combos, Bartolom del Presidio becomes a ferocious threat quite quickly, especially considering its mana cost
Of course, youll want plenty of spiders to go with Shelob
4 Shatter the Oath Color pie breaks always turn heads in the MTG community, since they're rare and make certain color combinations even stronger with effects they don't normally get
If you're playing Aristocrats, Mill, or Reanimation, or can produce infinite black mana in some way, he's likely going to be one of your win conditions
Its downside is that it cannot answer expensive things well, and you need to be multi-coloured to take advantage of it, but in both Modern and Legacy that isnt an issue as expensive cards arent played as much and most decks are naturally multi-coloured due to the manabases available in these formats