Shang Chi Martial Mentor

“If one or more +1/+1 counters would be put on a creature you control, twice that many +1/+1 counters are put on that creature instead.<br> Power-up — 5GG: Put three +1/+1 counters on Shang-Chi. <em>(Activate each power-up ability only once. Reduce the cost by his mana cost if he entered this turn.)</em>”