Magic: The Gathering Comprehensive Rules Changes - Ravnica: City of Guilds to Guildpact

Old rule (Ravnica: City of Guilds)	New rule (Guildpact)
413.2e. [Click to view all changes.]
413.2e. If an effect gives a player the option to pay mana, he or she may play mana abilities as part of the action. No other spells or abilities can be played during resolution.	413.2e. If an effect gives a player the option to pay mana, he or she may play mana abilities as part of the action. No other spells or abilities can normally be played during resolution.

Old rule (Ravnica: City of Guilds)

New rule (Guildpact)

413.2e.

If an effect gives a player the option to pay mana, he or she may play mana abilities as part of the action. No other spells or abilities can be played during resolution.

413.2e.

If an effect gives a player the option to pay mana, he or she may play mana abilities as part of the action. No other spells or abilities can normally be played during resolution.