Gagagigo

If Gogiga Gagagigo is in your graveyard after it
was on your battlefield this game, Gagagigo gains
+9/+9 and becomes a white Lizard Knight
creature with Protection from Artifacts and
Vigilance instead of its other types and colors.
Limited 3

"This young evildoer used to have an evil heart,
but by meeting a special person, he discovered justice."
— Story of Gagagigo