I dare you to attack Darnassus.
How to get
Ironbark Protector x 2 are a reward for raising a druid to level 10.
Costing 8 mana, Ironbark Protector is fairly pricey. However, its 8 health and Taunt ability means it is a good defender, and with 8 attack, it will likely kill whatever it is blocking.
Ironbark Protectors are a type of ancient protector, giant leafy defenders of Darnassus, the night elves and the druids. In World of Warcraft, the name "Ironbark Protector" refers to a group of corrupted ancients found in Dire Maul. However, given this minion's flavor text, this card may not specifically refer to those particular ancients, but to a general type of ancient protector who also share the epiphet "Ironbark".
The card art depicts Treebole.