Mat 16:4b (NIV) "A wicked and adulterous generation looks for a miraculous sign."
Mr 16:17 (NKJ) "And these signs will follow those who believe..."
But on to satanic "signs and wonders". In this we need to consider carefully the following verse:
2Th 2:9 (TCN) For at the coming of the Lord there will be great activity on the part of Satan, in the form of all kinds of deceptive miracles, signs, and marvels, as well as of wicked attempts to delude.
2Th 2:9 (NKJ) The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders.