Monolith of Corruption

When Monolith of Corruption enters play, and at
the beginning of your upkeep, choose one:
• Put a -1/-1 counter on target creature.
• Remove a -1/-1 counter from a creature. If you
do, put a blight counter on target nonland
permanent. Then if the number of blight
counters on that permanent is greater than or
equal to its mana value, its owner sacrifices it.