Krushoks clear debris from fertile fields, fallow fields, and battlefields.

Battlefront Krushok

Battlefront Krushok can't be blocked by more than one creature.
Each creature you control with a +1/+1 counter on it can't be blocked by more than one creature.

Ravnica: Clue Edition

Fate Reforged

The second ability applies only as blockers are declared. If a creature you control with no +1/+1 counters on it becomes blocked by more than one creature, putting a +1/+1 counter on it won’t change or undo the block.