THS: Boon of Erebos, Instant B Target creature gets +2/+0 until end of turn. Regenerate it. You lose 2 life.

Boon of Erebos

Target creature gets +2/+0 until end of turn. Regenerate it. You lose 2 life.

9/15/2013 The loss of life is part of the spell’s effect. It’s not an additional cost. If Boon of Erebos doesn’t resolve, you won’t lose life.