Library LarcenistHow it works & interactions with other cards

Stealing Knowledge

Library Larcenist features a triggered ability that triggers whenever it is declared as an attacker. Unlike many other 'saboteur' effects that require a creature to deal combat damage to a player, this Merfolk only needs to be pointed at an opponent or planeswalker to grant you a fresh card. Because the trigger happens during the declare attackers step, you receive the card before your opponent even has the chance to choose blockers.

Step-by-Step Resolution

First, you enter the combat phase and move to the declare attackers step. You choose Library Larcenist as an attacker and tap it. The 'Whenever this creature attacks' ability triggers and is put onto the stack. Both players have a chance to respond; if no one does, the ability resolves and you draw a card. Crucially, you may then cast spells (like Instants) or activate abilities using that new card before the game moves to the declare blockers step.

Common Pitfalls

A common mistake is assuming the creature must survive combat to draw the card. Since the ability triggers the moment it is declared as an attacker, you still draw the card even if Library Larcenist is destroyed by an effect like Murder later in the combat phase. Additionally, if Library Larcenist is put onto the battlefield already attacking (via certain special effects), it was never 'declared' as an attacker, and the ability will not trigger.

When to Strike

You should play Library Larcenist when you have ways to protect your attackers or when you simply need to cycle through your deck. It is most effective in the early to mid-game where its 2/2 stats are less likely to be immediately outclassed by large blockers, allowing you to pressure your opponent while maintaining resources.

Interaction examples

Double the Larceny

Roaming Throne

If you have Roaming Throne on the battlefield and chose 'Merfolk' or 'Rogue' as it entered, Library Larcenist's ability will trigger an additional time. When you declare Library Larcenist as an attacker, you will put two draw triggers on the stack, allowing you to draw two cards total for a single attack.

Maintaining Momentum

Solemn Simulacrum

In a scenario where you control both creatures, you can attack with Library Larcenist to draw a card immediately. If your opponent chooses to block and kill Library Larcenist, you have already replaced it in your hand. Meanwhile, Solemn Simulacrum sits back to provide defense, ensuring that when it eventually dies, you draw even more cards to keep your momentum going.