Auto (Vanguard) [LB4]: [Choose 2 of your <<Gold Paladin>> rear-guards, and place them at the bottom of your Deck in any order.] When this Unit Attacks, you may pay the Cost. If you do, choose up to 2 of your <<Gold Paladin>> Units, during this turn, they gain 5000 Power.
Auto: [Choose 1 <<Gold Paladin>> in your hand, discard it] When this Unit appears in a Rearguard Circle from your Deck, if your opponent has a Grade 2 or higher Vanguard, you can pay the cost. If you do, place this Unit in your Vanguard Circle.
Intimidating? Not so much. Quirky? Oh hell yes. Take a look at that second skill. In the event you're able to Superior Call him by way of Nimue, Vivianne, Spring Breeze Messenger, Lop Ear Shooter, or even the Vortimer family, you can immediately drop a card from your hand in order for him to occupy the Vanguard slot. Even better? You can follow up with another attack and a Twin Drive!! check. Not bad. In fact, this is the first way one can possibly superior ride from Grade 1 to Grade 3, skipping the Grade 2 in between. It manages to be balanced, though, on account it requires your opponent to be prepared for riding their own grade 3 already.
It's a bit of a pipe dream at this point, but one could theoretically build up some kind of unit stack on the bottom of the deck ala Tsukuyomi if you're able to spam skills akin to Pellinore's first enough. Speaking of that, it's a pretty impressive skill for having no CB cost. That means your rear-guards are free to use that damage as they wish before hopping off the field like a White Rabbit was meant to, then transferring a hefty 10K to your final attacking column. If we've learned anything from Majesty Lord Blaster, it's that giving up 10K worth of shields in order to gain 10K power is usually an even and worthwhile exchange.
I'm not about to get my hopes up on this one. Being what is almost certainly Kourin's brand of GP, it'll probably fall short just as her RP did in comparison to Aichi's, but you never know without testing! GP support is a lot more interchangeable in general.