Merchant of Kerebros

{1}: Merchant of Kerebros phases out.
{2}{b}: Merchant of Kerebros can't be blocked
this turn.
Whenever Merchant of Kerebros deals damage
to a player, look at that player's hand. You may
play one card from that player's hand as though
it had flash, spending mana as if it were mana of
any color to cast it. If you do so, put a card from
your hand into their hand.
"Thank you for your business, pza-tehk."