It will cost at least , even if more than eight creatures have died this turn.
While this ability can easily throw off many creature-light decks, and can even deal with resilient creatures possessing hexproof or indestructible, Anowon can lead a vampire-themed deck that will have no problem with such an ability
The Hakbal of the Surging Soul display commander is printed with the foil-etched treatment on a thicker cardstockgreat for showing off your commander but not legal for play
These are all definitely worth opening from a booster pack now and throughout the set's time in Standard
For me, the downside of losing a card seemed just very detrimental in the current value oriented metagame, but I might be very wrong with this evaluation
The plan is easy to follow: Gain life often, grow your board, and keep attacking