Disclaimer: I did not write this, but I liked it alot, so I decided to share it with you guys too!
Moving away from the TCG and OCG metagame for a moment - although perhaps not as far away as you might think - we introduce the ace card of the new Geargia archetype, "Geargiganto X"! An epic name for an epic card - let's take a look at why.
At first glance, "Geargiganto X" is a standard Rank 4 Xyz Monster, boasting a respectable 2300 ATK, while still leaving something to be desired, and a mundane 1500 DEF. However, like most monsters in this game, there is much more than meets the eye. "Geargiganto X" requires 2 Machine-Type Xyz Materials to summon, and once on the field, by detaching 1 of the cogs that make up this mighty machine, you can search your deck for a Level 4 or lower Machine-Type monster!
That's already a pretty punch-packing power, but if you choose to run the posterboy for the Geargia archetype, "Geargiano" or its more-modern cousin "Geargiano MK-II", you can Special Summon one of them from your Graveyard when "Geargiganto X" leaves the field!
And what's more, this titanium tyrant is exceedingly easy to summon! The new Geargia archetype cards introduced in Return of the Duelist offer consistency and speed when summoning any Rank 4 monster. "Geargiarmor" is a card boasting a hefty 1900 DEF for a Level 4 monster, and allows you to search for any "Geargia" when it's flipped face-up! This allows you to tutor "Geargiaccel", another Level 4 monster who's eager to get onto the field - if you control any "Geargia" monster, you can Special Summon it straight from your hand! Finally, "Geargiarsenal" makes bringing "Geargiarmor" to the field a breeze.
On the other hand, you may prefer to abuse the Geargia's excellent Graveyard control capabilities. "Geargiano" can net you a Level 4 Machine-Type from the Graveyard by tributing itself, while "Iron Call", a Normal Spell Card introduced in DT14 will grab you another, providing you already control one. Together, these cards give you the materials you need to Xyz Summon the king of klang instantly!
Now, some of you may be a bit concerned - "With only 2300 ATK, he'll get run over by "Evolzar Laggia" and other popular Rank 4 Xyzes!" I hear you say. This may be true, but by backtracking to his first effect, we can learn how this archetype deals with several threats in the current metagame by combining with another popular Machine-Type archetye, Machina.
"Machina Gearframe" is a Level 4 Machine-Type monster with 1800 ATK, and when summoned, searches for any "Machina" monster in your Deck, including the powerhouse monster, "Machina Fortress" - a monster that doesn't fear being discarded by the Wind-Up Loop, nor being destroyed by "Inzektor" monsters and boasts a high 2500 ATK to steamroll "Laggia" down with. Being Level 4, "Gearframe" is searched by "Geargiganto X", allowing you almost instant-access to the feisty Fortress.
Geargias are a new archetype that are both blessed and cursed with the Machine-Type, benefiting from excellent support in "Limiter Removal", but thoroughly threatened by the presence of "Chimeratech Fortress Dragon". Regardless, they are a threat and while it remains to be seen how they will fare in the upcoming metagame, underestimate them at your own peril.