Magic: The Gathering Comprehensive Rules Changes - Shards of Alara to Conflux

Old rule (Shards of Alara)	New rule (Conflux)
410.4. [Click to view all changes.]
410.4. When a triggered ability goes on the stack, the controller of the ability makes any choices that would be required while playing an activated ability, following the same procedure (see rule 409, "Playing Spells and Activated Abilities"). If no legal choice can be made (or if a rule or a continuous effect otherwise makes the ability illegal), the ability is simply removed from the stack.	410.4. When a triggered ability goes on the stack, the controller of the ability makes any choices that would be required while playing an activated ability, following the same procedure (see rule 409, "Playing Spells and Activated Abilities"). If a choice is required when the triggered ability goes on the stack but no legal choices can be made for it, or if a rule or a continuous effect otherwise makes the ability illegal, the ability is simply removed from the stack.

Old rule (Shards of Alara)

New rule (Conflux)

410.4.

When a triggered ability goes on the stack, the controller of the ability makes any choices that would be required while playing an activated ability, following the same procedure (see rule 409, "Playing Spells and Activated Abilities"). If no legal choice can be made (or if a rule or a continuous effect otherwise makes the ability illegal), the ability is simply removed from the stack.

410.4.

When a triggered ability goes on the stack, the controller of the ability makes any choices that would be required while playing an activated ability, following the same procedure (see rule 409, "Playing Spells and Activated Abilities"). If a choice is required when the triggered ability goes on the stack but no legal choices can be made for it, or if a rule or a continuous effect otherwise makes the ability illegal, the ability is simply removed from the stack.