I cast an Eaten by piranhas on ygra, sacrificing a creature do to its ward cost. Eaten by piranhas removed 3 abilities from Ygra, including the ability that makes creatures into artifact creatures. All creatures were still foods, and when the player proceeded to cast another creature a turn later, it was a food artifact as well. The ability text on Ygra was greyed out clearly showing it had been deactivated but it was still in effect. The other player had managed to get an emblem off that dealt me damage equal to the amount of healing they did. They were able to sac their board to kill me. I lost ranking because of it.