Amagdauss, Blood-reigned

Flying, lifelink
When Amagdauss, Blood-reigned enters the battlefield, you may pay life equal to X in its
casting cost. It enters the battlefield with X
+1/+1 counters on it.
Whenever you pay life as part of casting cost of
a spell or activating an ability of a permanent, Amagdauss, Blood-reigned deals that much
damage to each opponent.