Thorn Needler is generally considered to be a universally worse Hailstone Golem. A statline of 6/4 makes it incredibly easy for smaller minions to trade into it. For example, Argeon can buff a Bloodtear Alchemist (1 mana 2/1) with his Bloodborn Spell to 4/1 and trade it with this minion, creating unfavorable trades.
v. 0.0.1 - Added: Thorn Needler 4 mana 4/3 Strikeback
v. 0.0.4 - Stats changed to 4/4.
v. 0.0.6 - Removed Strikeback. Stats changed to 6/4.