Golden Forest Guardian

{t}: Reveal up to 3 cards from your hand. place
one of those cards face down and ask target
opponent to guess it's name. If they're right,
discard the card. If they're wrong put the card
back into your hand and do the following:
-If the card is Green, place +1/+1 counters equal
to it's converted mana cost on target creature.
-If it's White, exile target creature with power
less than it's converted mana cost.