Soleil, Setting Sun's Scholar

{u}{r}: Look at the top card of target opponent's library. That player names a card type, then reveal the top card of their library. If the card shares a type with the declared card, that player may add it to their hand. If the cards do not share a type, that player manifests it as a creature with "When this creature leaves the field, it deals 5 damage to its controller."

If a source would deal damage to an opponent, put a +1/+1 counter on target creature.