Kris, Driven Commander

Whenever a creature you control becomes
unable to attack or block, draw a card.
{u}{b/r}: Target untapped creature cannot attack
or block until your next turn. Activate only as a
sorcery, and only once per phase.
{r}{u/b}, {t}: Target creature must attack or block
this turn, even if is tapped. When Kris dies, you
may activate this ability once for free.
—"(I... can... still... hear... their voice...)"