Sephiroth, One-Winged Angel also becomes a much more potent sacrifice outlet, and one that is harder to block in combat
Making the big ol chunks of paint do the work for you
You will always be naming Assassins, which will keep most of your creatures on the battlefield
Exhaust abilities usually give you an easy way to remember theyve been activated, such as putting counters on the permanent
Lastly, I believe the tokens artwork and layout make it unique among existing tokens since Wizards took the token art direction in another way since the beginning days of token design
The only issue here is that she casts six mana, not easy to do outside of Green, but she's in White, one of the lesser colors of ramp, so if she's answered or countered you might make her very rough to recast with Command Tax