Case of the Lost Witness

When Scrutiny of the Guildpact enters, you may choose a creature card in your hand. If you do, that card perpetually incorporates W and gains "When you cast this spell, create a 2/2 white and blue Detective creature token." Multicolored creatures you control get +1/+1.

Disguise 1W Whenever Sleuth Instructor or another permanent you control is turned face up, seek a non-Elephant creature card with mana value 3 or less and cloak it. This ability triggers only once.

As an additional cost to cast this spell, you may collect evidence 5. Flying When Spotlight Falcon enters, if evidence was collected, conjure a card named Spotlight Falcon into your hand.

Thopters you control get +2/+0. At the beginning of your upkeep, conjure a card named Ornithopter into your hand.

Flying Whenever one or more creatures you control deal combat damage to a player, investigate. 1, Sacrifice a Clue: Seek an instant or sorcery card.

Choose an instant or sorcery card in your hand or graveyard. That card perpetually incorporates U and gains "When you cast this spell, draw a card." Then return a multicolored instant or sorcery card from your graveyard to your hand.

As Ominous Lockbox enters, secretly choose a number between 1 and 20. When an opponent casts a spell with mana value equal to the chosen number, sacrifice Ominous Lockbox. If you do, copy that spell, and you may choose new targets for the copy. 2, Sacrifice Ominous Lockbox: Draw a card.

Flying When Cackling Observer enters, target opponent reveals each nonland card in their hand. You choose one of those cards and exile it. When Cackling Observer leaves the battlefield, the exiled card's owner seeks a nonland card with lesser mana value than the exiled card.