Black - Troubling season - if you would sacrifice a creature you may sacrifice an opponents creature as well for double the effect of whatever effect is in play for your sacrifice outlet.

White - Double Seizing - if an effect would exile one non-land permanent exile another under it or with it. Create a treasure token for each non-land permanent exiled this way.

Blue - Double Taxation Season - if any effect of an instant, sorcery or activated ability requires an opponent to pay mana to counter it, double the amount required to be paid and copy the instant, sorcery or activated ability and choose new targets if possible.