Caleb, Growing Arcanist

Hexproof
Whenever you draw your second card each turn, you may put a +1/+1 counter on Caleb, Growing Arcanist. Then, draw cards equal the number of +1/+1 counters on Caleb.
{t}: Draw a card, discard a card.
{2}{r}, {t}: Caleb deals 2 damage to Target Creature.
"...Books."