How to block Magneto that ass

storm’s is like… NO ARPE TODAY!
doom’s is like… BE GONE EVILDOER!

Mashing on lk or lp (depending on which character you are) may work. It can be successful if your opponent gets sloppy with the reset. If you try to block you’ve got a 25% chance of guessing right, and a 99% chance of not seeing it coming.