Delibird's role in the mainline games has primarily been that of a wild Pokmon encountered in cold or mountain areas, such as the Ice Path in Johto
Until then, may your Hour of Devastation be a little less devastating than it was for the people of Amonkhet.
The Paradox of Slither Wing Insect/Effect/EARTH/Level 6 ATK 2400/DEF 1500 If you would Synchro, Xyz, or Link Summon a "The Paradox" monster from your Extra Deck, you can use this card in your hand as 1 of the materials
While Master Duel is in its infancy, and still may not fully draw in veteran players who have grown accustomed to other Yu-Gi-Oh
Faceless Haven seemed to only see play in specific mono-colored snow decks that could support it, but I assume the Sanctuary will see play in a broader range of decks, including control decks that can handle having lands that only produce colorless