That's an interesting strategy I didn't think of, but how do you get so many of the same tile?
Luck I guess, they just kept appearing and I kept taking them. I must have had like 4 of them by the end of things. And I was not really adding that many others and I was taking removals of other dice types.
You can also withhold them in your hand between "restocks" which allows you to have 3 in your hand even if there is only one in your deck.