The card that I would design would have the sneak ability with Ranged. Why because it appears that most cards that I see with sneak have Melee attack. This would allow a partial counter to Mylor Cowling the summoner that gives thorns. This card would have the typical 1 or 2 attack with a 2 or 3 speed and 3 health. I think it would be in the Earth splinter. The Vine Assassin grabs the last traveler in the group that dared to disturb it's slumber.