Gravecrawler While I believe Bloodghast is a better recursive creature, I consider Gravecrawler a more universally powerful card, mostly due to its obscene combo potential
Its a much more rare kind of black deck which wholly embraces discard spells including non-targeted ones and the attritional approach to gameplay they encourage
Its spoilers ability breaks your opponents normal gameplay by damaging them each time they scry, surveil, or search
However, Jace's power level is well known, and even if he doesn't find a home in the versions of Control, it's possible that Dimir or even Izzet lists will be interested in the Planeswalker due to its combination of abilities in a format with Fetch Lands
Chandra, Spark Hunter Its hard not to rate a planeswalker among the top 10 cards of the set, so that shows how confident ( not ) I am that this card will be a meta-defining one
So there you have it