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

Old rule (Shards of Alara)	New rule (Conflux)
306.4. [Click to view all changes.]
306.4. A creature or planeswalker is removed from combat if it leaves play (such as by being destroyed or removed from the game); if its controller changes; if it stops being a creature or planeswalker, respectively; or if an effect removes it from combat. A creature is also removed from combat if it regenerates (see rule 419.6b). A creature that's removed from combat stops being an attacking, blocking, blocked, and/or unblocked creature. A planeswalker that's removed from combat stops being attacked.	306.4. A permanent is removed from combat if it leaves play, if its controller changes, if an effect specifically removes it from combat, if it's a planeswalker that's being attacked and stops being a planeswalker, or if it's an attacking or blocking creature that regenerates (see rule 419.6b) or stops being a creature. A creature that's removed from combat stops being an attacking, blocking, blocked, and/or unblocked creature. A planeswalker that's removed from combat stops being attacked.

Old rule (Shards of Alara)

New rule (Conflux)

306.4.

A creature or planeswalker is removed from combat if it leaves play (such as by being destroyed or removed from the game); if its controller changes; if it stops being a creature or planeswalker, respectively; or if an effect removes it from combat. A creature is also removed from combat if it regenerates (see rule 419.6b). A creature that's removed from combat stops being an attacking, blocking, blocked, and/or unblocked creature. A planeswalker that's removed from combat stops being attacked.

306.4.

A permanent is removed from combat if it leaves play, if its controller changes, if an effect specifically removes it from combat, if it's a planeswalker that's being attacked and stops being a planeswalker, or if it's an attacking or blocking creature that regenerates (see rule 419.6b) or stops being a creature. A creature that's removed from combat stops being an attacking, blocking, blocked, and/or unblocked creature. A planeswalker that's removed from combat stops being attacked.