Maralen of the Mornsong commands a deck with mostly Swamps that wants to use Ad Nauseum to power up Exsanguinate by drawing your deck and pitching it to Skirge Familiar as early as turn 3 or 4
We got to see a lot of cards, including many callbacks to previous Lorwyn characters, mechanics like Evoke, cycles like the Incarnations, or individual beloved cards like Bitterblossom
Galarian Zigzagoon (Fantastical Parade) is not available in Regular Packs
Side sets in the Digimon Card Game dont usually have a ton of value per card or even any meta cards that will see a ton of tournament play, but in EX7 Digimon Liberator, there are plenty of cards that are strong enough to win a tournament and collectible chase cards for every type of fan of the game
These discard spells are being used as an answer to the opponent's biggest threats
They can't try to remove the card from your graveyard to stop you from paying the cost