Simia Digressione sine Causa

At the beginning of each end step target creature becomes a gibbon creature with base power and toughness 2/2. Then if there are ten or more
gibbons in play, sacrifice this and destroy all
gibbons.
Gibbon creatures lose all abilities and gain protection from other gibbons.
"They call it a digression when your neighbor becomes
a gibbon. But when you become one the word they use
is... ..is... apologies I suddenly lost my thought. I'm
feeling a bit thirsty..."