Emrakul, the Aeons Torn is one of the highest mana costing cards, coming in at 15 mana, but once you cast it you essentially win the game outright
For example, Jafar has a variant called Wicked Sorcerer where the only real difference is hes sporting purple and gold robes instead of his signature red and black but wait a second, isnt the original Jafar already a wicked sorcerer
Perhaps because this card has become popular in Magic's more casual format explains why the value of this card tends to remain flat among its various versions
Shutting down your opponents creatures and nonbasic lands for a turn gets Thalias disruptive nature across, while cashing in your own lands for cards gives the Gitrog Monster time to shine
When asking if a card should be banned, first, we need to know the goals of the format to figure out the purpose of banning cards