She costs less because she triggers once a turn and can be attacked to be removed from the board
While his life gain aspect is situational and disruptable it is also greatly powerful
This means that as long as Tlincalli Hunter's controller is putting creatures into exile with 'impulsive draw' effects, or through any other creature with an Adventure, they can play said creatures without paying their mana costs
Or Kirlia could evolve into Gallade ASR, which can search for any Supporter once per turn
It kind of closely resembles Card not found quite often, but than it just becomes so much more, when you are able to get it online
Flaying Tendrils and Yahennis Expertise both seem generally better, and Fumigate, Descend upon the Sinful, Engulf the Shore, Sweltering Suns, and Kozileks Return make it confusing if were even in the market for a black sweeper to begin with