The lower their life totals get, the more likely they'll be to make unfavorable blocks and the less likely they'll be to make bold, risky plays
In fact, Primeval Titan has been the face behind some of the most degenerate decks in Modern, starting with the Cloudpost deck that was prevalent in the initial days of the format, to the Red-Green Valakut deck, and then the Amulet Titan deck both in its degenerate form with Summer Bloom, and the more toned down version we see today with Dryad of the Ilysian Grove and Urzas Saga
Getting your choice of removing one creature or debuffing all creature tokens in play is a modal spell worth taking
Zodiark, Umbral God Embrace the blackness and get Zodiark who is an undeniably indestructible, mass murdering threat to the game
I don't know how much play this will see outside of a few niches, but shadow is a powerful ability (that not many creatures have), so it's cool to see
Damage is dealt either by creatures or by spells
