Reversion of Forms

Enchant creature with an activated ability
Enchanted creature's activated abilities have
''Activate only once each turn.''
All instances of {t} in enchanted creature's
original text are replaced with {ut}. All instances
of {ut} in its original text are replaced with {t}.
''The emerald square or the pale grey sphere? Which
one will you make yours? ''—Twila, Gilt-Leaf sage