'Ravnica' cards

Whenever a white creature dies, return it to the battlefield under its owner's control at the beginning of the next end step. Whenever a nonwhite creature dies, return it to its owner's hand at the beginning of the next end step. Whenever chaos ensues, creatures can't attack you until a player planeswalks.

Whenever a creature dies, its controller distributes a number of +1/+1 counters equal to its power among any number of target creatures they control. Whenever chaos ensues, each player exiles all creatures they control and creates X 1/1 green Saproling creature tokens, where X is the total power of the creatures they exiled this way. Then planeswalk.

Whenever a player casts an instant or sorcery spell, that player copies it. The player may choose new targets for the copy. Whenever chaos ensues, instant and sorcery spells you cast this turn cost {3} less to cast.

When you planeswalk to Kilnspire District and at the beginning of your first main phase, put a charge counter on Kilnspire District, then add {R} for each charge counter on it. Whenever chaos ensues, you may pay {X}. If you do, Kilnspire District deals X damage to any target.

When you planeswalk away from Orzhova, each player returns all creature cards from their graveyard to the battlefield. Whenever chaos ensues, for each opponent, exile up to one target creature card from that player's graveyard.

If you cast a spell this turn, you can't attack with creatures. If you attacked with creatures this turn, you can't cast spells. Whenever chaos ensues, you gain life equal to the number of cards in your hand.

If an effect would create one or more tokens, it creates twice that many of those tokens instead. If an effect would put one or more counters on a permanent, it puts twice that many of those counters on that permanent instead. Whenever chaos ensues, until end of turn, whenever you tap a land for mana, add one mana of any type that land produced.

Whenever a creature deals combat damage to a player, its controller may draw a card. Whenever chaos ensues, you have no maximum hand size for the rest of the game.