Nazgul, Claiming Blades

Haste, Trample
If Nazgul, Claiming Blades would do combat
damage to a creature prevent that damage and
instead put that many curse counters on that
creature. If the amount of curse counters on that creature is greater than or equal to that creature's toughness, gain control of target creature, it is
now a ring wraith in addition to its other types.