Invasion. Conquest. Domination. Oh, how they make Vona's heart sing.

Vona, Butcher of Magan

Vigilance, lifelink
{T}, Pay 7 life: Destroy target nonland permanent. Activate only during your turn.

Secret Lair Drop

"For four hundred years, I have led armies of conquest. These lands hold nothing that can stand against me."

The Lost Caverns of Ixalan Commander

March of the Machine Commander

Ixalan

Vigilance, lifelink
{T}, Pay 7 life: Destroy target nonland permanent. Activate this ability only during your turn.

Vona's last ability can be activated during any step or phase of your turn, including the combat phase. It's possible to attack with Vona and then activate its ability before blockers are declared. Doing so won't remove Vona from combat.