Eerie Whenever an enchantment you control enters and whenever you fully unlock a Room, put a possession counter on this creature
As there is rather little in the way to assist you to mana ramp (Knight of the White Orchid), consider beefing up with some mana-rocks like Thran Dynamo, Commander's Sphere and Chromatic Lantern
One Mana, Draw a Card Yes, that is just 12 lands being played here, courtesy of this deck having 13 cards that say, one mana, draw a card and four cards that do the same for two mana
While you could cast it for WUBRG, you will only get 2 devotion to black once it hits the board
Cleanly answering this card is a tall ask, especially when Gruul can back it up with haymakers like Wrenn and Seven or Goldspan Dragon the next turn
It turns ETB creatures into repeatable engines and unlocks some of the cleanest infinite loops in red