Prisma, Colorgiving Angel

Flying
Once per turn, you may reveal a card from your
hand and choose a color. The revealed card is the
chosen color in addition to its other colors.
•Whenever a green or red creature you control
attacks, put a +1/+1 counter on them.
•Whenever you cast a blue or white spell, you
may pay {1}. If you do, draw a card.
•Whenever a black card is put into your
graveyard, each opponent loses 1 life.