Saviors of Kamigawa

Whenever you cast a Spirit or Arcane spell, you may sacrifice Dreamcatcher. If you do, draw a card.

Return target enchanted permanent to its owner's hand.

Flying Whenever you cast a Spirit or Arcane spell, you may have target player mill X cards, where X is that spell's mana value.

Copy target instant or sorcery spell. You may choose new targets for the copy.

Flying Soramaro, First to Dream's power and toughness are each equal to the number of cards in your hand. {4}, Return a land you control to its own...

As long as you have more cards in hand than each opponent, Secretkeeper gets +2/+2 and has flying.

You may have Sakashima the Impostor enter the battlefield as a copy of any creature on the battlefield, except its name is Sakashima the Impostor, ...

All creatures get -X/-0, where X is the number of cards in your hand.

At the beginning of each player's draw step, that player draws an additional card.

Search target opponent's library for an artifact, creature, enchantment, or land card. Put that card onto the battlefield under your control. Then ...

Flying Whenever the fourth spell of a turn is cast, flip Erayo, Soratami Ascendant.

Flying Whenever you cast a Spirit or Arcane spell, you may have target player put the top X cards of their library into their graveyard, where X is...