The key against Dormammu + Drones is to never give Dormammu the breathing room to call them. Drones have the same projectile durability as your Hawkeye assist, FYI.
Also, super awesome X-23 tech that I never see used except by one guy:
Talon Attack H seems pointless, but it's actually one of her best ways of getting in. It lets you travel across the entire screen, but you can still call assists before and after it. You can do two things with this:
1) Jump, call an assist, and Talon Attack H. You're in for free, and your assist call is safe.
2) Jump, Talon Attack H, and call an assist on the way down while you d.H, or you can use Talon Attack L to come back down to make the assist cross up again.
I never see anyone do this, but it's pretty effective. I met an X-23 player that did this while abusing the Tron Bonne assist in Vanilla, and it drove me nuts.