The name of the card is an allusion to the traditional Christmas carol called "Deck the Halls", as well as a meta-reference to "topdecking" which refers to playing a card on the same turn you draw it, often in a way to swing the game in your favor (which also provides its connection to the miracle keyword)
Tutor up Craterhoof Behemoth, an Eldrazi titan, or anything else you need to end the game in Commander
Championship promos, serial prizes, and manga alternate arts dominate the top of the price chart
Opposition Agent A bit of a controversial one as we kick things off, but I do think Opposition Agent is underplayed
If you want the short version: the London mulligan homogenizes game play, promotes mulligans in ways that further push this, and trades "non-games" where someone doesn't take actions with "one note games" where someone takes exactly two or three actions and the other person either answers them and instantly wins or misses and instantly loses
2/1 Illustrated by Maji Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp