Amethyst, the Runt

Riot (This creature enters with your choice of a +1/+1 counter or haste.) Trample Other Gems you control have riot. Shapeshift — When Amethyst attacks, choose up to one other target attacking creature. If Amethyst’s power is less than that creature’s power, put a number of +1/+1 counters on Amethyst equal to the difference.