They are the heavily played Sign in Blood effects of this ability in Red
Power To The People Artifacts and Equipment aside, the Final Fantasy VII Commander deck has a bit of a power-matters sub-theme going on
Seven cards are a lot to look at from the top of your deck
The creature side of things is Questing Druid, a two-mana green 1/1 that reads: Whenever you cast a spell that's white, blue, black, or red, put a +1/+1 counter on Questing Druid. In the right deck, this card isnt just card draw but a terrifying threat, as it could grow absolutely massive fairly quickly
Ultimately, it reaches $48 here thanks to the inspired choice of Seedborn Muse
Its also one of the few draw X effects on a black card that doesnt cost you life, which matters