Sahir, Visitor in Darkness [Mystery Booster: Commander Edition]

Eminence — At the beginning of your upkeep, Sahir deals 1 damage to you. This ability triggers only if Sahir is in the command zone or on the battlefield.
Whenever a source you control deals exactly 1 damage to you and whenever a spell or ability you control causes you to lose exactly 1 life, put a +1/+1 counter on Sahir. If this is the second time this ability has resolved this turn, draw a card.