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Magic: The Gathering Comprehensive Rules Changes

Guildpact to Dissension (Single Change View)

General changes

Old rule (Guildpact) New rule (Dissension)

410.9d.

If an ability triggers when a creature blocks or is blocked by a particular number of creatures, the ability triggers if the creature blocks or is blocked by that many creatures when the attack or block declaration is made. Effects that add or remove blockers can cause such abilities to trigger. This also applies to abilities that trigger on a creature blocking or being blocked by at least a certain number of creatures.

410.9d.

An ability that reads "Whenever a creature blocks [this creature], . . ." triggers once for each creature that blocks the named creature. It will also trigger if an effect causes a creature to block the attacking creature, even if it had already been blocked that combat. It won't trigger if the creature becomes blocked by an effect rather than a creature.