Sorinjace, Last Heir of Markov

Lifelink, haste
Whenever Sorinjace, Last Heir of Markov,
attacks, you may sacrifice another creature, if you
do Sorinjace, Last Heir of Markov, gets +X/+X
until end of turn were X is equal to the sacrificed
creature's power.
"I am the last decedent of the Markov line, I have
come to claim my birthright." - Sorinjace