Karlov of the Ghost Council
Commander 2015 — mythic
Legendary Creature — Spirit Advisor
Karlov of the Ghost Council rulings:
2015-11-04: The ability triggers just once for each life-gaining event, whether it’s 1 life from an attacking creature with lifelink or 4 life from Faith’s Fetters.
2015-11-04: A creature with lifelink dealing combat damage is a single life-gaining event. For example, if two creatures you control with lifelink deal combat damage at the same time, the ability will trigger twice. However, if a single creature with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will trigger only once.
2015-11-04: In a Two-Headed Giant game, life gained by your teammate won’t cause the ability to trigger, even though it causes your team’s life total to increase.