The Crimson AvengerHow it works & interactions with other cards

A Flash of Insight

Because The Crimson Avenger has Flash, you can cast it at any time you could cast an instant. This is essential because its triggered ability requires a 'target spell an opponent controls' on the stack. When it enters the battlefield, you target an opponent's spell and begin searching your library for a card with an identical mana value to cast for free.

Resolving the Hunt

Upon resolution, you reveal cards from the top of your library one by one. You stop the moment you find a card with the same mana value as the targeted spell. You then cast that card without paying its mana cost, following all normal timing rules for casting (though the ability allows you to cast it during the resolution of the trigger). Finally, all revealed cards and your library are shuffled together.

Key Timings and Missed Targets

If the targeted spell is no longer on the stack when the ability tries to resolve (for example, if it was countered or resolved first), the ability is removed from the stack and you do not reveal any cards. Additionally, if you reveal your entire library and find no card with a matching mana value, you simply shuffle your library and nothing is cast.

When to Strike

This card is best used when your deck has a diverse range of mana values. By targeting a spell with a common mana value in your deck, you maximize your chances of hitting a high-impact spell to swing the tempo of the match in your favor.

Interaction examples

Matching the Golem

Solemn Simulacrum

If your opponent casts Solemn Simulacrum (mana value 4), you can flash in The Crimson Avenger. Its trigger targets the Simulacrum. You then reveal cards until you hit a card with mana value 4 in your own library, casting it for free. Both your new spell and the original Simulacrum will eventually resolve.

Double the Vengeance

Roaming Throne

With Roaming Throne on the battlefield naming 'Wizard', The Crimson Avenger's ability triggers twice when it enters. You can target two different spells your opponent controls (or the same spell twice). You will resolve the process twice, potentially casting two free spells from your library before shuffling.