If no one does, the next thing waiting on the stack will resolve
Drain Bloodchief Ascension At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment
Playing lands likewise is pretty nice and is a real card advantage trick, and is one of the things that often screws up Sensei's Divining Top or Citadel type decks
While free is good, sometimes free sometimes 3 mana feels inconsistent and overpriced when cards like Loran's Escape, Blacksmith's Skill, or Tamiyo's Safekeeping can protect a single card even better, as hexproof deflects spells like Path to Exile or Swords to Plowshares that indestructible doesnt help with
The problem was that it resulted in too much card draw
Furthermore, Grist can grind out an endless stream of blockers or threats while being difficult to remove using cards that are normally good against creature decks (Prismatic Ending and Unholy Heat aside)