Her power comes down to a combination of factors, mainly her ability to gain life when your creatures enter play, and her ability to damage all of your opponents when one of your creatures dies
The number of cards you discard is equal to Horrid Shadowspinner's power at the time you chose to draw cards, even if another effect changed the number of cards you drew or in the unusual case where Horrid Shadowspinner's power has changed since you chose to draw cards
The deck then features a multitude of spells that allow you to roll dice including creatures (Celebr-8000, Chaos Channeler, Clay Golem, Earth-Cult Elemental, Herald of Hadar, Hoarding Ogre, Iron Mastiff, Lightfoot Rogue, Monoxa, Nothic, Swarming Goblins), Sorceries (Attempted Murder, Myrkul's Edict, Recruitment Drive, Thunderwave), instants (Contraband Livestock, Farideh's Fireball, Six-Sided Die), and many more
It appears more details will be revealed on which events will award the new tokens
In the game, all but one of her cards (Chandra, Acolyte of Flame) can deal direct damage to various targets
Beyond Boosters give your players a curated experience with every pack: they'll find classic characters, items, and moments from their favorite Universes Beyond stories inside