User blog comment:RaijinSenshi19/Make It Competitive: Systemic/@comment-9693174-20150525050234/@comment-5230496-20150525060424

i dont like the idea of trying to protect one card the entire game. your opponent will catch on to what you're doing and then they'll punish you once you're out of protection.

black edge is more of a card that you use as bait. the opponent will see it as a threat and try to kill it. if they dont kill it then punish them on your turn. dont use up valuable resources on a card that already demands a minus every turn to be useful, especially when the card already forces you to use very mediocre cards.