Nithral, Brutal Slayer

This spell cannot be countered.
Trample, Menace, Dethrone, Rampage 2
{t}: Nithral deals damage equal to its power to
target creature. If a creature dealt damage in this
way would die, put three +1/+1 counters on
Nithral.
Whenever Nithral deals combat damage to a
player, Untap him.