Official Rulings
If I play Swallow Whole (DT 148) with just one creature in play, what happens?
Resolve abilities in the order in which they are written. In the case of Swallow Whole, the active player will choose one creature (resolving as much as they can), then purge the creature with the lowest power, which will purge the single creature in play. The remainder of the ability text on Swallow Whole will not resolve.
Source: Rulebook
If I play Swallow Whole (DT 148) with just one creature in play, what happens?
Resolve abilities in the order in which they are written. In the case of Swallow Whole, the active player will choose one creature (resolving as much as they can), then purge the creature with the lowest power, which will purge the single creature in play. The remainder of the ability text on Swallow Whole will not resolve.
Source: Rulebook
Commentary
If an ability says "Choose a creature," the Active Player may choose a Friendly or Enemy creature when resolving the effect.
Source: Rulebook
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