Tranquil Thicket has 22 printings.
Commander Anthology
Duel Decks Anthology: Elves vs. Goblins
Commander 2014
Vintage Masters
Commander 2013
Duel Decks: Izzet vs. Golgari
Commander 2011
Magic Online Theme Decks
Archenemy
Duel Decks: Elves vs. Goblins