Judge Ethred is one of the most powerful creatures of the Mercenaries since for only 3 crystals we have a creature with 1 and 6 attack and defense points respectively.
In addition, it has the abilities "Blood Ties", which means that enemy cards can't attack allied cards of the same element with Basic Strike, and "Strengthen 1", thanks to which it increases the attack of permanently one of the random allied cards on the battlefield at the end of each turn.