Hound of the Baskervilles

First Strike, Deathtouch
Cumulative upkeep—Sacrifice a creature. (At the beginning of your upkeep, put an age counter on
this permanent, then sacrifice it unless you pay its
upkeep cost for each age counter on it.)
When Hound of the Baskervilles deals damage to a
player, that player discards all the cards in their
hand.