Milotic 70 / 147 Supreme Victors

Cleansing Ring : 20

You may discard 2 cards from your hand. If you do, remove 4 damage counters from 1 of your Pokémon.

Scale Blow : 90-

Does 90 damage minus 10 damage for each card in your hand.

Its lovely scales are described as rainbow colored. They change color depending on the viewing angle.