I have yet to hear about or find any person, much less more than one to have EVER done greater works that Jesus did. Don't know of anyone walking into multiple towns and healing everyone there. (this would at least be equal to Jesus). Or people having the demon possessed running to find them as they came into a town, begging to not be cast out. (again, this would be at least equal to the works of Jesus). Or bringing the sight to at least 3 know blind people (again, at least equal to Jesus). Walking on water and calling another out onto the water with Him (once again, at least equal).
Since we have no person who has even done at least equal miracles, we must look again at what is being spoken to. What is greater than healing people completely physically? What is the only work that Christ did not do in complete form that exceeds the things He lists. Was it not the spiritual healing and unification of man with God, that could only coming into being AFTER the death and resurrection of Christ Jesus?
Is it not salvation? Not that we ourselves save them yet we share in that work of Christ according to scripture:
At such an event - are not all the things done at once - the demons would be removed, the blind would see, the lame would walk, the dead (spiritually) would be raised, the leprousness of our sins cleansed for all time, the sick and infirm made whole. We were given the ministry of reconciliation. A work of God, which he imparted to us to fulfill on His behalf having the full authority and power of Heaven to do, every moment, at any time - what Christ did.
Jesus said - I have come to seek and save that which was lost
And He also said - as my Father hath sent me, even so send I you.