Potamotherium

When this creature comes into play, Bolster 2. (Choose a creature with the least toughness or tied with the least toughness among creatures you control and put two +1/+1 counters on it.)
Potamotherium ('river beast') an extinct genus of caniform carnivoran from France and Germany. It has been previously assigned to the mustelid family, but recent work suggests that it represents a relative of pinnipeds.