Swarm CullerHow it works & interactions with other cards

Tapping into Value

Swarm Culler features a triggered ability that activates whenever it becomes tapped for any reason. While the most common way to trigger this is by attacking, it also triggers if the creature is tapped for a spell's cost, an ability, or by an opponent's effect. Upon tapping, you have the option to sacrifice another creature or artifact to draw a card.

The Sacrifice Choice

The ability uses a reflexive structure: 'you may sacrifice... If you do, draw a card.' This means you choose whether or not to sacrifice at the moment the ability resolves. You cannot sacrifice Swarm Culler to its own ability because the text specifies 'another' creature or artifact. If you have no other eligible permanents when the ability resolves, you simply cannot perform the sacrifice.

Strategic Timing

Because this is a triggered ability, it goes on the stack and can be responded to. If you attack with Swarm Culler, the ability triggers immediately in the Declare Attackers step. You will draw your card before your opponent even declares blockers, potentially giving you an instant-speed combat trick to use during the fight.

Interaction examples

Double Harvest

Solemn Simulacrum

First, you attack with Swarm Culler, which triggers its ability. When the ability resolves, you choose to sacrifice Solemn Simulacrum. This results in two separate 'draw a card' triggers: one from Swarm Culler's effect and one from Solemn Simulacrum's own death trigger, allowing you to net two cards from one attack.

Royal Proclamation

Roaming Throne

With Roaming Throne on the battlefield naming 'Insect', you attack with Swarm Culler. Because Roaming Throne is an artifact, it satisfies the sacrifice requirement. Swarm Culler's ability triggers twice due to the Throne's static ability. You can resolve the first trigger to sacrifice the Roaming Throne itself to draw a card, though the second trigger will then require a different permanent to sacrifice if you wish to draw again.