Equinox, Duality Engine

Whenever a creature's power and toughness
would be increased, except by this ability, its
power and toughness are decreased by that much instead. Whenever a creature's power and
toughness would be decreased, except by this
ability, its power and toughness are increased by
that much instead.
{4}{w/b}, {t}: Double the value of all power and
toughness increases and/or decreases until end
of turn.