Raz Aquato

Discard a card: Raz Aquato gains hexproof from
the color of your choice until end of turn.
{w}{u}, {t}: Target creature must attack target
opponent or planeswalker this turn if able. That player or permanent's controller puts the top
three cards of their library into their graveyard.
(It can't attack its controller or its controller's planeswalkers.)