March of the Machine: The Aftermath

Tolarian Contempt | Enchantment | | When Tolarian Contempt enters the battlefield, put a rejection counter on each creature your opponents control. At the beginning of your end step, for each opponent, choose up to one target creature they control with a rejection counter on it. That creature's owner puts it on the top or bottom of their library. | Tuan Duong Chu

Kiora, Sovereign of the Deep | Legendary Creature | Merfolk Noble | Vigilance, ward {3} Whenever you cast a Kraken, Leviathan, Octopus, or Serpent spell from your hand, look at the top X cards of your library, where X is that spell's mana value. You may cast a spell with mana value less than X from among them without paying its mana cost. Put the rest on the bottom of your library in a random order. | Chris Rallis

Niv-Mizzet, Supreme | Legendary Creature | Dragon Avatar | Flying, hexproof from monocolored Each instant and sorcery card in your graveyard that's exactly two colors has jump-start. (You may cast that card from your graveyard by discarding a card in addition to paying its other costs. Then exile it.) | Joshua Raphael