Backup Bolsterer

When Backup Bolsterer enters the battlefield, put a
+1/+1 counter on another target creature. It gains
vigilance until end of turn.

Whenever Backup Bolsterer attacks, choose a
creature you control with the least toughness or tied
for the least toughness among creatures you
control. Put a +1/+1 counter on that creature.

When Backup Bolsterer deals combat damage to a
player, transform it.