355.1. If the card is a spell, or has an effect that specifies a choice "As I am played," those choices are made now.
355.2. For Units, choose a valid Location where that Unit will be placed upon being Played.
355.3. For Spells and Abilities with a bulleted list of modes to choose from, make the appropriate choices now.
355.4. For Spells and Abilities that Move one or more Units, choose a valid Location as the Move Destination for each Move that will be performed.
355.5. If a card requires you to specifically choose one or more Game Objects, that choice is made now.
355.7. When a card Chooses one or more specific Game Objects to affect, it is Targeted unless indicated otherwise by the rules in this section.
355.8. In order to put a spell or ability on the chain, valid choices must be made for all targets.
355.9. A target is a valid choice if it meets all of the following requirements:
355.10. A game object, player, or zone mentioned in the text of a spell, activated ability, or triggered ability is a target UNLESS any of the following are true:
355.11. Some cards identify a group of Targets with Targeting Requirements that must be met by the group as a whole.
355.12. If a spell specifies that a player may perform a Game Action on some number of Game Objects, then all choices are considered targeted and chosen independently of the decision to perform the Game Action.
355.13. If a card specifies that a player chooses "any number" or "up to" some number of Game Objects to be affected, they may choose any number of available targets, including zero. If they choose zero, the spell or ability can be played without any targets.
355.14. Splitting
355.15. These choices cannot be changed after this step.
355.16. A player may not make choices during this step that will deterministically result in illegal choices or actions later in this process unless they have no choice. Example: A player plays a card which reads "as an additional cost to play this, kill the unit you control with the most Might. Give a friendly unit +[M] equal to the killed unit's Might this turn. Predict 2." They cannot choose to target their unit with the highest Might during this step of finalization.
355.17. If a spell or ability requires one or more players to make choices that are not outlined in this section, they are made on resolution.