They are either mana-positive or neutral , and in the case of storm, act as a way to cast a spell for free since you get the mana you spent on them back right away
That is somewhat how I feel about this card

1 Wildcard of any rarity A common (24.9%), uncommon (62.1%), rare (7.6%), or mythic rare (less than 1%) card from the main set A common (less than 1%), uncommon (1.3%), rare (less than 1%), or mythic rare (less than 1%) scene card An uncommon (2.6%), rare (less than 1%), or mythic rare (less than 1%) sewer card A mythic rare silhouette card (less than 1%) 1 Rare or mythic rare card A rare (84.9%) or mythic rare (9.2%) card from the main set A rare scene card (less than 1%) A rare (4.1%) or mythic rare (less than 1%) sewer card A mythic rare silhouette card (less than 1%) 1 Traditional foil card of any rarity A common (61.5%), uncommon (27.7%), rare (6.7%), or mythic rare (less than 1%) card from the main set A common (less than 1%), uncommon (less than 1%), or rare (less than 1%) scene card An uncommon (less than 1%), rare (less than 1%), or mythic rare (less than 1%) sewer card A mythic rare silhouette card (less than 1%) 1 Land card A non-foil (48%) or traditional foil (12%) common dual land A non-foil (32%) or traditional foil (8%) rooftop basic land 1 Non-foil double-sided token Note: Percentages may not sum to 100 due to rounding

Dismember will only cost you 1 mana to play and will net you only minus two life after your lifegain and replace itself with Yshtola on the field
With how successful this mobile game has been in just its first few weeks, it is proof that it's time for a certain spin-off game to finally make a resurgence after multiple decades of no new entries