Vow of Improvement

Enchant Creature
If an effect would put one or more +1/+1
counters on enchanted creature, it puts twice
that many +1/+1 counters on enchanted creature
instead.
"My strength was insufficient today, but I shall not
give up. I swear on my honor to become greater than
myself - to push past what holds me back now. I may
have failed, but I am not done yet."