Rules of Combat

During each of Grots attack phases, all creatures
will attack the player with the highest health.
When creatures enter the battlefield, they must
face an enemy creature if possible. Only one
creature can face another. Creatures that face off
with one another can only be blocked by
the creature they are facing. Creature positions
can be changed at start of any combat phase.
Grot's creatures will always block a facing
enemy creature, if it is not tapped.