“To solve — [Condition]” means “At the beginning of your end step, if [condition] and this Case is not solved, this Case becomes solved.”
April 14, 2023 · March of the Machine
rule 719.3a not present in this release
November 18, 2022 · The Brothers’ War
While casting a prototyped spell, use only its alternative power, toughness, and mana cost when evaluating those characteristics to see if it can be cast.