R'torav, Accursed Warrior

{2}{r}: Add a burn counter to up to 3 target lands
that your opponents control. For as long as a
land has a burn counter on it, it has "At the beginning of your upkeep, this land deals damage
to you equal to the number of burn
counters it has."
{2}{b}, Sacrifice R'torav Accursed Warrior: Each
player takes damage equal to the number of burn counters on lands they control. Remove all burn counters from all lands.