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If your deck is already running 3-4 of them then Ranger of Eos becomes an insane tutor + card advantage

The cards also have cost reduction abilities, a reinvigorated tactic in multiple inks in Winterspell, and Elisa Maza Transformed Gargoyles effect Forever Strong can have some serious benefits, especially being an easy answer to Tiana Restaurant Owner

The Chaos Creator LV8 DARK Thunder Effect ATK/2300 DEF/3000 Cannot be Normal Summoned/Set

Geartown is meant to be used as a Ballista activation ability sacrifice for drawing out more monsters for fusion material, as well as Clockwork Night when possible, with Clockwork Night also making for a decent counter to anything that changes your monster types (ie: zombie decks)

As you can see, knowing what to remove from your main deck is just as crucial as knowing what to substitute in