Repel the Sandwurm

Creature your opponent controls with power 10
or greater, cannot attack you or a planeswalker you control.
"Sandwurms: although sandwurms are massive and scary. They are generally very lazy and will not attack you if they perceive a threat to themselves. Best way to drive away a sandwurm is to make yourself as big as possible and launch a lightning bolt
in there general vicinity."
-Stalia Survival Guide, 4th Edition