arceus pokemon card gx & Dialga & Palkia 221/236 When your TAG TEAM is Knocked Out Arceus & Dialga & Palkia

At the beginning of combat on your turn, if you have a full party, choose target nonland permanent an opponent controls

It was brought back recently in Battle for Zendikar, where it was rightfully pushed into uncommon from common

Syr Konrad, the Grim will hit each opponent for each creature card milled into their graveyard, turning your regular 99-card mill into a two-pronged attack

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)