It is powerful, 4 mana to start making everyone sacrifice permanents every turn is very strong, but it's at its strongest when she is your commander and the consistency of that slot can be taken advantage of at its fullest
Its worth remembering World Enchantments count for every creature on the battlefield, meaning your opponents creatures also have haste, and you can only have one World Enchantment active at one table at the same time
Storm is considered to be Magics most broken mechanic in history by WotC
Contains printable sheet music
This cheaper mana cost allows for interesting decision-making around whether you want to efficiently use your mana at the cost of another card, or be more card advantage conscious by holding up three mana instead
Because curses are a bit slow and expensive for Constructed play in formats like Pioneer or Modern, this ranking of all the curses in Magic primarily has Commander in mind