Ryuk's Death Note

{x}{b}, {t}: Ryuk's Death Note places up to {x}
death-counters on any target creature on
the battlefield.
At the start your next upkeep, destroy all targets
with a death-counter.
Death-counters place from
Ryuk's Death Note can't be countered.
...And when you die, ill be the one to write your
name in my Death Note.