Myrathli, Tired Sagittar

Reach
{t}: Myrathli, Tired Sagittar deals X damage to target attacking creature, where X is the number of Archers
you control.
You may choose not to untap this creature during
your untap step. If you do, she gains a rest counter.
When Myrathli, Tired Sagittar untaps, remove all
rest counters from her. You gain 2 life for each
counter removed in this way.
"Look, I'm just aiming to go back to bed."