Jharis, Finger-Smith Giant

Whenever this card deas combat damage to a
player, reveal the top card of their library. If it is
a non-land card you may play it for its converted
mana cost until the end of the turn.
{r}{r}: +2/+2 and trample until end of the turn.
You may use this ability only once per turn.
{b}{b}: -2/-2 and menace until end of turn.