Murders at Karlov Manor

Agrus Kos, Spirit of Justice | Legendary Creature | Spirit Detective | Double strike, vigilance Whenever Agrus Kos, Spirit of Justice enters the battlefield or attacks, choose up to one target creature. If it's suspected, exile it. Otherwise, suspect it. (A suspected creature has menace and can't block.) | Jason A. Engle

Aurelia, the Law Above | Legendary Creature | Angel | Flying, vigilance, haste Whenever a player attacks with three or more creatures, you draw a card. Whenever a player attacks with five or more creatures, Aurelia, the Law Above deals 3 damage to each of your opponents and you gain 3 life. | Lie Setiawan

Dog Walker | Creature | Human Citizen | Vigilance Disguise {R/W}{R/W} (You may cast this card face down for {3} as a 2/2 creature with ward {2}. Turn it face up any time for its disguise cost.) When Dog Walker is turned face up, create two tapped 1/1 white Dog creature tokens. | Milivoj Ćeran

Lightning Helix | Instant | | Lightning Helix deals 3 damage to any target and you gain 3 life. | Eli Minaya

Meddling Youths | Creature | Human Detective | Haste Whenever you attack with three or more creatures, investigate. (Create a Clue token. It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") | Matt Forsyth

Warleader's Call | Enchantment | | Creatures you control get +1/+1. Whenever a creature enters the battlefield under your control, Warleader's Call deals 1 damage to each opponent. | Aldo Domínguez

Fuss // Bother | Instant // Sorcery | | Put a +1/+1 counter on each attacking creature you control. // Create three 1/1 colorless Thopter artifact creature tokens with flying. Surveil 2. | Dominik Mayer

Push // Pull | Sorcery // Sorcery | | Destroy target tapped creature. // Put up to two target creature cards from a single graveyard onto the battlefield under your control. They gain haste until end of turn. Sacrifice them at the beginning of the next end step. | Eli Minaya

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