Scrambled Senses

If a spell or effect would give a creature +X/+X, that creature gets -X/-X instead, and vice versa. The game is true for +1/+1 and -1/-1 counters, gaining and losing life, drawing and discarding cards, winning and losing coin flips, and winning and losing the game as part of a spell or effect. (This does not change effects like drawing at the draw step, or discarding down to your maximum hand size at the cleanup step. Players still lose the game for having 0 or less life, or drawing out of an empty library, or conceding.)