Rhino, Bearer of Truths

Whenever Rhino, Bearer of Truths deals damage
to an opponent, that player reveals their hand and
you may play a card from their hand whose mana
cost is less or equal to the damage dealt without
paying its mana cost.
{u}{u}{b}{b}: Discard any number of cards from
your hand, Rhino, Bearer of Truths deals
damage to target opponent equal to the number
of cards discarded this way. Draw that many
cards, minus one, at the beginning of your
endstep.