Valdra's Terrible Command

(You may cast a legendary sorcery only if you control a legendary creature or planeswalker.)
Kicker {x}{b}
Valdra's Terrible Command deals 4 damage to up to X target creatures, if it was kicked it also deals 4 damage to up to X target players and you gain life equal to the total damage dealt.
Valdra's only orders are for slaughter.