First up we have Tribe-Shocking Virus:
Once per turn: You can banish 1 monster from your hand; destroy all face-up monsters with the same Type as the banished monster.
Tribe's more balanced cousin, TSV proves to be a good side-deck option against decks like Gravekeeper, Samurai, X-Sabers, Blackwings, Machines, Fairies, and Plants. It's still good enough to defend itself, but it will most likely be a card you don't play on Game 1.
Next up we have Telepon D.D.
When this face-up card you control is banished: You can target 1 Psychic-Type monster with 1500 ATK or less in your Deck; banish the target. During your next Standby Phase, Special Summon that monster.
A fun little weapon for the RFG Psychics, it makes for quite the interesting floater. Combine it with the other existing Psychics for some Banishing shenanigans to maybe pull synchros and/or Xyz summons without having to play anything else. Should be interesting to see how it changes the deck.
Next up we have Watt King Cobra:
This card can attack your opponent directly. When this card inflicts Battle Damage to your opponent by attacking directly: select 1 "Watt" monster from your Deck and add it to your hand.
Not only does it make Watts an even better deck, this snake helps get Giraffe, Pheasant, or Dragonfly a lot quicker. Now they have both a searcher and a floater. Surely, this snake makes Watt decks a serious force now.
Another one most might not like, but I find great is Preacher of the Ice Barrier:
If you control a face-up "Ice Barrier" monster: You can Special Summon this card from your hand. If you do, you cannot Special Summon Level 5 or higher monsters during this turn. You can Tribute this card to target 1 "Ice Barrier" monster in your Graveyard except "Preacher of the Ice Barrier"; Special Summon that target.
Upon first seeing this, I immediately thought of Wetlands. However, this is also a miniature General Gantala that can revive from the grave. Heck, use this to revive Gantala and then revive again for any other Ice Barrier. Could this finally help Ice Barriers be taken seriously? Not only does it help it's own deck, but it also allows for greater reverse toolboxing for the Wetlands variant.