Tranquil Thicket will eventually be either played or cycled as needed
This red enchantment is especially effective in a Voltron deck that relies on constant attacking
Putting this card into a deck filled with cards that specialise in providing lots of card draw - think of Maleficent, Mistress of All Evil, Shenzi, Hyena Pack Leader, Huey, Savvy Nephew and Lucky, The 15th Puppy - means potentially raking in tons of lore in a single turn, as long as youre able to draw them at the right time and keep them alive
When another Black dork ETBs, you drain a life from each foe, so she's a win-con tied to a legendary dork for Command Zone purposes
(It loses its other colors and creature types.) If a player is instructed to put a card into their graveyard from their library without using the word "mill," (by the effect of Rowan's Grim Search from Wilds of Eldraine , for example), that card isn't a legal target for The Master's last ability