Ring of the Nazgul

{t}; Add {b}.
Whenever you pay life to cast a spell or activate
an ability, target creature gets -1/-1 until end of
turn for each life paid this way.
{b}, Pay 3 life; Draw a card
'Nine he gave to Mortal Men, proud and great,
and so ensnared them. Long ago they fell under the
dominion of the One, and they became Ringwraiths,
shadows under his great Shadow.'
— Gandlaf