Rolf, The Braveheart

Flying, Lifelink, Double Strike
If Rolf, The Braveheart of another creature you
control would die you may roll a d20 instead:
1-8 — The creature dies.
9-14 — The creature gains Persist.
15-19 — Place a +1/+1 counter on that creature
instead.
20 {line} Place an Indestructible counter on that
creature instead.