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Magic: The Gathering Comprehensive Rules Changes

Shadowmoor to Eventide (Single Change View)

General changes

Old rule (Shadowmoor) New rule (Eventide)

Regenerate

Regeneration is a destruction-replacement effect. "Regenerate [permanent]" means "The next time [permanent] would be destroyed this turn, instead remove all damage from it, tap it, and (if it's in combat) remove it from combat." Because it's a replacement effect, it must be active before the attempted destruction event. Abilities that trigger from damage being dealt still trigger even if the permanent regenerates. See rule 419.6b.

Regenerate

Regeneration is a destruction-replacement effect. "Regenerate [permanent]" means "The next time [permanent] would be destroyed this turn, instead remove all damage from it and tap it. If it's an attacking or blocking creature, remove it from combat." Because it's a replacement effect, it must be active before the attempted destruction event. Abilities that trigger from damage being dealt still trigger even if the permanent regenerates. See rule 419.6b.