Blood Sludge

At the beginning of your upkeep, for each slug, horror, swamp, and/or blood token you control,
put a sludge counter on target permanent.
{1}, remove a sludge counter from a permanent
you control: choose one—put a +1/+1 or -1/-1 counter on target creature with a sludge counter,
or untap or tap target land with a sludge counter,
or a creature with a sludge counter you control
fights target creature an opponent controls