Sleviel,slayer of champions

at the beginning of your upkeep sacrifice a
legendary creature or sacrifice Sleviel,slayer of champions
whenever a legendary creature dies chose 1,
put +3/+0 on Sleviel,slayer of champions or
exile them under Sleviel,slayer of champions
Sleviel,slayer of
champions has all abilities of all cards under him
"time to wright your will"