When this Case enters, choose target creature you don't control. Each creature you control deals 1 damage to that creature.
To solve — Three or more creatures attacked this turn. (If unsolved, solve at the beginning of your end step.)
SolvedSolved is a keyword ability found on Case cards. See rule 719, “Case Cards.” “Solved” is followed by ability text. Together, they represent a static ability, a triggered ability, or an activated ability.
For a static ability, “Solved — [Ability text]” means “As long as this Case is solved, [ability text].”
For a triggered ability, “Solved — [Ability text]” means “[Ability text]. This ability triggers only if this Case is solved.”
For an activated ability, “Solved — [Ability text]” means “[Ability text]. Activate only if this Case is solved.” (CR 702.169) — Creatures you control get +1/+0.