This is one of my cards from my Holiday Stamp-A-Stack which uses masking. You need to use your stamping positioner (i.e., Stampin-a-ma-jig) to make sure the greeting is stamped straight (this was the challenging part).
Stamps: Snow Swirled (tree and snowflake), Four the Holidays, Patterned Pines (star)
Inks: Always Artichoke, Encore Gold
Papers: Always Artichoke, Brushed Gold, Whisper White
Difficulty Rating (1-Easy, 5-Hard): 2