Xin, Ward of Curiosity

Ward—Reveal your hand. (Whenever this
creature becomes the target of a spell or ability
an opponent controls, counter it unless that
player reveals their hand.)
•Xin, Ward of Curiosity gets +1/+0 for each
instant and sorcery card in your graveyard.
•Whenever you discard a card for the first
time each turn, draw that many cards.