Check the tournament description to see which format is being played and choose a format that you enjoy most and that suits your playing style
It's even possible to play a second Shahrazad in the subgame to create Magic -ception
If there's a cost associated with having it attack, the player isn't forced to pay that cost, so it doesn't have to attack in that case either
Most tokens in Commander that swarm the board can be nuked with this spell, with the only things saving them being large buffs from cards like Elesh Norn or +1/+1 counters
The card is, however, extremely powerful
This might have had as much to do with cEDH play as its Legacy success, but it'll be interesting to see if, and how much, it slumps now