5 Shadow of the Enemy Yes, Shadow of the Enemy requires a lot of mana to make work, but there are plenty of ways to get a lot of mana even in Tales of Middle-earth (Smaug would like to give you 14 treasure tokens, just as an example)
Daybound (If a player casts no spells during their own turn, it becomes night next turn.) Creature Graveyard Glutton WardDiscard a card
Pain lands, talismans, Sol Ring, and more than 300 other lands can tap for colorless mana
Oketra the True can also be a creature that attacks for 6 double striking damage with a toughness-matters deck in the mold of Doran, the Siege Tower or Baldin, Century Herdmaster
If the double-faced card is put into a hidden zone (your hand or library), use the substitute card again
Not often is the Acolyte better than the god they serve, but this card has a ton of upside