Pair it with Winter Orb (or its brother Static) and nothing will untap EVER
(Equipment, Auras you control, and counters are modifications.) Illustrated by Carlos Dattoli Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Not Legal Brawl Not Legal Legacy Legal Comp
Note that each player chooses creatures they don't control, meaning each player (other than one) could decide to blow up a specific player's creatures , making this a one-sided board wipe
And, without some substitutions, the starter deck can't stand alone against competitive custom decks either
Between the Ancestral and Demonic Tutor, well likely find enough mana to cast the All Hallows Eve quickly (or an Animate Dead), so this hand has everything we need, and is a snap keep
This is especially true when you can score a bonus like Storeroom or Fungi Cavern from Lost Mine of Phandelver to help keep attacking for more