Murders at Karlov Manor

Flotsam // Jetsam | Instant // Sorcery | | Mill three cards. Investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") // Each opponent mills three cards, then you may cast a spell from each opponent's graveyard without paying its mana cost. If a spell cast this way would be put into a graveyard, exile it instead. | Anastasia Ovchinnikova

Leyline of the Guildpact | Enchantment | | If Leyline of the Guildpact is in your opening hand, you may begin the game with it on the battlefield. Each nonland permanent you control is all colors. Lands you control are every basic land type in addition to their other types. | Daarken

Niv-Mizzet, Guildpact | Legendary Creature | Dragon Avatar | Flying, hexproof from multicolored Whenever Niv-Mizzet, Guildpact deals combat damage to a player, it deals X damage to any target, target player draws X cards, and you gain X life, where X is the number of different color pairs among permanents you control that are exactly two colors. | Chris Rallis