If these games go really slow, then some of these might be good at breaking those stalled boards, especially this Crystal
Golbez is a hyper-efficient surveil and recursion engine in an Artifact deck: its basically what you get if you powercrept Contraband Kingpin and Oversold Cemetery, then smushed the two together, without raising the mana cost
Shimmering Skies - Ruby and Amethyst Best cards: Elsa, the Fifth Spirit Ready to Let Loose uses one of Lorcana's strongest color combinations to create a strong general control deck
If you're looking to upgrade Cavalry Charge, look no further
Just remember, this elephant can only fight so many creatures before dying, so I highly encourage you to pair it with the likes of Shield of the Oversoul to make it last
Everybody gets so wrapped up in the holiday spirit that the game ends, one way or another