Murders at Karlov Manor

Call a Surprise Witness | Sorcery | | Return target creature card with mana value 3 or less from your graveyard to the battlefield. Put a flying counter on it. It's a Spirit in addition to its other types. | Julia Metzger

Case of the Gateway Express | Enchantment | Case | When this Case enters the battlefield, choose target creature you don't control. Each creature you control deals 1 damage to that creature. To solve — Three or more creatures attacked this turn. (If unsolved, solve at the beginning of your end step.) Solved — Creatures you control get +1/+0. | Edgar Sánchez Hidalgo

Case of the Pilfered Proof | Enchantment | Case | Whenever a Detective enters the battlefield under your control and whenever a Detective you control is turned face up, put a +1/+1 counter on it. To solve — You control three or more Detectives. (If unsolved, solve at the beginning of your end step.) Solved — If one or more tokens would be created under your control, those tokens plus a Clue token are created instead. (It's an artifact with "{2}, Sacrifice this artifact: Draw a card.") | Joshua Cairos

Neighborhood Guardian | Creature | Unicorn | Whenever another creature with power 2 or less enters the battlefield under your control, target creature you control gets +1/+1 until end of turn. | Daren Bader

Not on My Watch | Instant | | Exile target attacking creature. | Jason A. Engle

Perimeter Enforcer | Creature | Human Detective | Flying, lifelink Whenever another Detective enters the battlefield under your control and whenever a Detective you control is turned face up, Perimeter Enforcer gets +1/+1 until end of turn. | Josh Hass

Sanctuary Wall | Artifact Creature | Wall | Defender {2}{W}, {T}: Tap target creature. You may put a stun counter on it. If you do, put a stun counter on Sanctuary Wall. (If a permanent with a stun counter would become untapped, remove one from it instead.) | Josu Solano

No More Lies | Instant | | Counter target spell unless its controller pays {3}. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. | Liiga Smilshkalne

Soul Search | Sorcery | | Target opponent reveals their hand. You choose a nonland card from it. Exile that card. If the card's mana value is 1 or less, create a 1/1 white and black Spirit creature token with flying. | A. M. Sartor

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

Sumala Sentry | Creature | Elf Archer | Reach Whenever a face-down permanent you control is turned face up, put a +1/+1 counter on it and a +1/+1 counter on Sumala Sentry. | Nicholas Elias