The Glass shader does refraction by perturbing the image behind it. Can be also used to make a frost effect!
Tinting. Set alpha to 0 if you like to make “crystal clear glass”.
Left: A blank sprite with alpha set to 0. Right: A stained glass sprite and some emission.
Here you need to use a Normal Map. NextGenSprites Extra Assets already provides you with a collection of Normal Maps made for Refraction!
Set the refraction strength, you can also invert it by going negative.
Set Emission strength. Works similar to Emission Intensity.