Putrid Goblin and Solemnity - one should be banned
It's not a bug as it totally follows the rules, but infinite sacrifice combos at instant speed shouldn't be a part of the game. Ban putrid goblin
It's right up there with the frikkin' cat/cauldron combo in terms of sucking the fun out of the play experience. Either ban the goblin, or ban the card that prevents it getting perpetual -1,-1. I suppose WOTC thinks it's fine, since it can kill you if they get a ping card on the board. Nothing like having your time wasted as your opponent hogs turn priority with his endless loop immortal goblin..