TAP, Collect evidence 3: Add one mana of any color. Put an unlock counter on Cryptex. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)

Sacrifice Cryptex: Surveil 3, then draw three cards. Activate only if Cryptex has five or more unlock counters on it.

Indestructible

When Barbed Servitor enters the battlefield, suspect it. (It has menace and cant block.)

Whenever Barbed Servitor deals combat damage to a player, you draw a card and you lose 1 life.

Whenever Barbed Servitor is dealt damage, target opponent loses that much life.

When this Case enters the battlefield, create a 2/1 black Skeleton creature token and suspect it. (It has menace and cant block.)

To solve - You control no suspected Skeletons. (If unsolved, solve at the beginning of your end step.)

Solved - 1B, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery.

As an additional cost to cast this spell, you may collect evidence 6.

Destroy all creatures. If evidence was collected, exile a card from an opponents graveyard. Then search its owners graveyard, hand, and library for any number of cards with that name and exile them. That player shuffles, then draws a card for each card exiled from their hand this way.

Whenever one or more nontoken creatures you control die, investigate. This ability triggers only once each turn. (Create a Clue token. Its an artifact with ´´2, Sacrifice this artifact: Draw a card.´´)

Menace

When Hunted Bonebrute enters the battlefield, target opponent creates two 1/1 white Dog creature tokens.

When Hunted Bonebrute dies, each opponent loses 3 life.

Disguise 1B

Flash

When Illicit Masquerade enters the battlefield, put an impostor counter on each creature you control.

Whenever a creature you control with an impostor counter on it dies, exile it. Return up to one other target creature card from your graveyard to the battlefield.

Target opponent exiles the top X cards of their library face down. You may look at and play those cards for as long as they remain exiled. If you cast a spell this way, you may spend mana as though it were mana of any type to cast it.

Destroy target permanent an opponent controls. Its controller may search their library for a basic land card, put it onto the battlefield, then shuffle.

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.

When Blood Spatter Analysis enters the battlefield, it deals 3 damage to target creature an opponent controls.

Whenever one or more creatures die, mill a card and put a bloodstain counter on Blood Spatter Analysis. Then sacrifice it if it has five or more bloodstain counters on it. When you do, return target creature card from your graveyard to your hand.

For each of X target permanents, create X tokens that are copies of that permanent.

Create a 2/2 white and blue Detective creature token. If a creature died this turn, you gain 2 life, surveil 2, then investigate. (Create a Clue token. Its an artifact with ´´2, Sacrifice this artifact: Draw a card.´´)

Flying

When Ezrim, Agency Chief enters the battlefield, investigate twice. (To investigate, create a Clue token. Its an artifact with ´´2, Sacrifice this artifact: Draw a card.´´)

1, Sacrifice an artifact: Ezrim gains your choice of vigilance, lifelink, or hexproof until end of turn.

Draw two cards. Then you may discard two cards. When you do, Ill-Timed Explosion deals X damage to each creature, where X is the greatest mana value among cards discarded this way.

Menace

Whenever Izoni, Center of the Web enters the battlefield or attacks, you may collect evidence 4. If you do, create two 2/1 black and green Spider creature tokens with menace and reach.

Sacrifice four tokens: Surveil 2, then draw two cards. You gain 2 life.

Whenever you cast an instant or sorcery spell, choose one -

- That spell gains deathtouch and lifelink.

- Create a 2/2 red Imp creature token with ´´When this creature dies, it deals 2 damage to each opponent.´´

Flying, vigilance

Whenever Kellan, Inquisitive Prodigy attacks, destroy up to one target artifact. If you controlled that permanent, draw a card.

Investigate. You may play an additional land this turn. (Then exile this card. You may cast the creature later from exile.)

Menace, ward 2, haste

Whenever Kylox, Visionary Inventor attacks, sacrifice any number of other creatures, then exile the top X cards of your library, where X is their total power. You may cast any number of instant and/or sorcery spells from among the exiled cards without paying their mana costs.

Whenever Lazav, Wearer of Faces attacks, exile target card from a graveyard, then investigate. (Create a Clue token. Its an artifact with ´´2, Sacrifice this artifact: Draw a card.´´)

Whenever you sacrifice a Clue, you may have Lazav become a copy of a creature card exiled with it until end of turn.