It's fun flavor, and when you think about The Night Before Christmas is really just the flavor text, anyway
The other, Malach of the Dawn is from Planar Chaos , a set designed to showcase alternate realities in Magic an apt place for one of Magics only male angels
I like to think of Gyrus as a Jund version of Alesha, Who Smiles at Death
Anti-Venom, Horrifying Healer (SPM) $47 The second most expensive card from the Standard set is Anti-Venom, Horrifying Healer
Rule 5: Each instance of the main mechanics and themes for each block must be included
That gives the set strong character support: Ace, Blackbeard, Luffy, Whitebeard, the Admirals, Buggy, Ivankov, Boa Hancock and Yamato all appear in important chase slots