Sirus the Impassioned

Creatures with power greater than Sirus the Impassioned can't attack you.
The Great —{u}{u}{g}{g}: Create a colorless X/ X
Shapeshifter creature token where X is equal to
the greatest toughness among creatures you
control.
The Relentless —{3}{r/g}, {t}: Put X +1/+1 counters
on a creature where X is equal to the greatest
power among creatures you control.