It is no where in the realm of comparison between Flik Skyshiv. Not even on the same planet!
And Vilespine Slayer is so much better than this card that is is ridiculous. Rogue is a TEMPO class, so it 100% KILLS a minion AND plays ANY stats on board to push further damage. Priest is not a tempo class, they have had *maybe* 2 semi aggressive decks throughout Hearthstone's history. So this might kill something against a board that already has 4 minions on it.
This card is bad folks. The best Dragon Priest has currently is Chronobreaker which sees literally no play at all. This card will follow suit unless they release an actually good Dragon Priest card.