Mark 16:17
And these signs will accompanythose who believe: In My name they will drive outdemons; they will speak in new tongues; 18they will pick up snakes with their hands, and if they drink any deadly poison, it will not harm them; they will lay their hands on the sick, and they will be made well.”
Those things would continue happening as long as the antichrist was being held back so that the apostles and disciples would finish witnessing about the gospel to all tribes. As soon as they had finished their mandate, the antichrist comes accompanied by fake signs and wonders to deceive many. The genuine signs had to cease, for God is not God of confusion.
There's a long list in Mark 16 all accompanied those who believe then, you can't say that we are only left with tongues as the most flourishing sign.