Elizar the Selfless

Flying, vigilance
Whenever you cast an instant or sorcery spell with
a martyr cost, it deals X damage to any target and
you gain X life, where X is the number of
creatures martyred.
When Elizar the Selfless dies, you may exile it. If
you do, create a token that's a copy of it, except it
has base power and toughness 1/1 and is a Spirit
in addition to its other types.