Eggnogger's 'Stache is a mythic Artifact card from Happy Holidays (HHO), collector number 24. Current market price: — (foil $30.35), TCGplayer market prices via Scryfall.
Lands you control have "{T}: Refill your mug with a festive drink." (If you don't have a mug, go grab a mug! It's the holidays!) At the beginning of combat on your turn, if you have a drink 'stache, put two +1/+1 counters on each creature you control.