Mr. Ring-a-ding, Happy Cartoon

Hexproof

if it’s neither day nor night as Mr. Ring-a-ding enters, you may pay {g}, if you do it becomes day.

Whenever it becomes Day or Mr. Ring-a-ding attacks, put
a Light Counter on Mr. Ring-a-ding.

at the beginning of your upkeep, if there are fifteen or more Light Counters on Mr. Ring-a-ding, remove all those counters and transform Mr. Ring-a-ding.