Chariot

Undying, Reliance (As this creature enters the battlefield, place a Reliance counter on target creature
you control. When you no longer control any creatures
with a Reliance counter, you may put five +1/+1
counters on this creature. If you don't, sacrifice it. Creatures with a Reliance counter have shroud.)
As long as there is one or more +1/+1 counters
on Chariot, it must attack each combat if able
and has menace.