I was playing with Jace. Blocked with Grimgrin taking one of their creatures. The zombie looked like it froze in attack position. Previous 2 rounds I had sent a creature packing with successive Mist Raven, also had scorpion out. I unsummoned a Boneclub Shambler and tried to attack with everything but the Mist Ravens drew a targeting line instead of attacking. Summoned over the scorpion to see if it would break whatever was going on but was still only able to attack with GG and the zombie.