Blu, Mansion PrinceHow it works & interactions with other cards

Investigating the Estate

Blu, Mansion Prince has two distinct triggered abilities. The first triggers whenever he enters the battlefield or attacks, allowing you to investigate. This creates a Clue token, which is an artifact with the ability to pay two mana and sacrifice itself to draw a card. This provides a steady stream of resources and fuel for his second ability.

Sacrificing Clues for Rooms

The second ability triggers whenever you sacrifice a Clue, regardless of why you sacrificed it. When this resolves, you choose one of the thirty existing Room cards at random. You then create a token that is a copy of one half of that Room card and immediately unlock it. Because you are creating a token of a specific half, you do not pay any mana costs associated with the Room's doors.

Timing and Randomness

It is important to note that the Room selection is entirely random and external to your deck. You do not need to own the Room cards in your library or sideboard. Since the token enters as a copy of a specific half and is 'unlocked,' any 'When you unlock this door' abilities will trigger immediately upon the token's creation.

Strategic Deployment

To maximize Blu, Mansion Prince, you should look for ways to sacrifice Clues efficiently. While using the Clue's own ability to draw cards is the most common method, any effect that requires sacrificing an artifact will also trigger Blu. This makes him a powerhouse in decks that can generate and consume tokens quickly.

Interaction examples

Doubling the Investigation

Roaming Throne

If you control Roaming Throne with 'Human' or 'Noble' chosen as the type, Blu, Mansion Prince's enter-the-battlefield ability triggers twice, giving you two Clues. Furthermore, when you sacrifice a Clue, Blu's second ability triggers twice because of the Throne, allowing you to create and unlock two random Room halves instead of one.

The Standard Loop

Clue

When Blu, Mansion Prince attacks, his ability triggers and you create a Clue token. During your post-combat main phase, you pay two mana to sacrifice the Clue and draw a card. This triggers Blu's second ability; you randomly select a Room card from the set of thirty, choose one half, and put a token of that half onto the battlefield unlocked.

Value Engine

Solemn Simulacrum

While Solemn Simulacrum helps you reach the four mana needed to cast Blu, it also provides a target for other sacrifice effects. If you have an external way to sacrifice artifacts, sacrificing a Clue generates a Room via Blu, while Solemn Simulacrum ensures you have the land base to keep the game moving.