Mysterious Trinket

{2}, Tap a creature you control: Put a research counter on Mysterious Trinket.
At the beginning of your upkeep, if Mysterious Trinket has 3 or more research counters on it, you may transform it.
"Well, it doesn't look like it does much. But with some more research, I bet we could get it to do something!"
--Corin Desertswimmer, Xerxian Artificer