You need to dive in headfirst and not look back
Copies of your world-ending beasts
Legendary Creature - Wraith Noble Merry, Warden of Isengard Partner with Pippin, Warden of Isengard (When this creature enters, target player may put Pippin into their hand from their library, then shuffle.) Whenever one or more artifacts you control enter, create a 1/1 white Soldier creature token with lifelink
United Front, on the other hand, is great even outside of Ally decks, as itll give you an insta-board while also buffing everything with +1/+1 counters
Of course, its also perfectly capable of high-volume production
The Undercity creates Treasure tokens and 4/1 black Skeleton creature tokens with menace