Gideon of The Trials display bug
I had used Gideon of the Trial's +1 ability to become a creature and had attacked my opponent. The opponent cast unsummon on Gideon and returned him to my hand. He retained the small numeric side counter when he was in my hand, and this display continued when I recast him. When I next activated him as a creature, the new count display was overlaid on the previous count display, resulting in garbled display. When he reverted to non-creature status at the end of that turn, one of the two counts disappeared, but the original count remained, seemingly permanent at that point.