It might be better to play such cards over making a clumsy splash but they are not things you want
The grey chief spoke in their dreadful language, and every now and then all the Wargs in the circle would answer together
Playing a shock land on turn two and paying the life cost, then passing the turn, is a great way to make your opponent think you are holding counter spells, removal, or a card with the flash ability
It could leave the battlefield, leave your control, or stop being one of those creature types
It takes inspiration from both Omnath, Locus of Rage and The Gitrog Monster builds to form a powerful combo-style deck that can easily spiral out of control
Finally, self-mill decks love these effects as ramp sources and ways to utilize more of the milled cards