1 Dragon-Type Tuner + 1 or more non-Tuner Winged Beast-Type monstersWhen this card is Synchro Summoned: You can target 1 Level 3 or lower Dragon-Type "Dragunity" monster in your Graveyard; equip that target to this card. Once per turn: You can send 1 Equip Card equipped to this card to the Graveyard; double this card's ATK until the End Phase.
The best deck to summon this monster is with his own Archetype, Dragunity monsters, except for the Synchro monsters, are all Dragon-type Tuners and Winged-Beast-type non-tuners which fulfill Dragon - Vajrayana’s summoning condition. Equip Dragunity Phalanx to any level 4 Dragunity monster, then special summon Phalanx and use him with the level 4 Dragunity monster to summon Dragunity - Vajrayana.
You can send to the graveyard any Equip card attached to Dragunity - Vajrayana to double his attack. The problem is he only attaches one Equip to himself when he is summoned. To use his effect multiple times you can equip him with These cards which recycle themselves back to the deck.
Dragunity - Vajrayana’s effect doubles his current attack not his original attack. Therefore you can gain much more from his effect if you boost him with Equip cards first. You can then later use these equip cards as cost to double his attack at a later turn.
Equip Dragunity - Vajrayana with Twin Swords of Flashing Light - Tryce so that he can attack twice with his huge stats. But only equip Twin Swords of Flashing Light - Tryce after you double your attack so that you only lose 500 attack.
Places cards from Graveyard in Spell & Trap Zone / Sends from your field to your Graveyard for cost
Changes own ATK value
I'm rather surprised they left out so many important things here. Alright, this'll be quite a bit of text...
1st: Vajrayana can also be special summoned in one turn with Aklys and Militum in hand. Go check their effects, I'm too lazy to explain. xD
2nd: Use skills like Beatdown, Tie that tilts or peak performance to be able to boost your Vaj to lethal dmg. (Use skill BEFORE Vaj's effect)
3rd: Sending an equipped Aklys to the graveyard let's you destroy any card on the field. On 2nd turn it'll likely be the only monster they control (don't summon Vaj on 1st turn. Low base stats and allows for counter play.) Pair that up with a lucky Hey, Trunade! pick-up and it's almost guaranteed lethal.
4th: Equip Vaj with divine lance. The trap immunity is really nice and since barely any meta-player knows this card and is too lazy to read they'll bust their traps anyway. It also provides a much needed ATK boost and you can resupply Vaj with more Aklys' from your deck every turn. Pair that with with dragunity legion and you'll never run out.
It's a really nice F2P deck since the base set up for the deck only requires you to pull from one box. Also, it was able to handle any meta with a few tweaks up to now. E.g. I included spiritualism (standard pick-up at the card trader) for this 6 samurai bs meta, since the dual wield trap is a serious threat to any synchro deck and it can't be negated by Shi En. (Again, many players don't read and still use the effect on it, which allows you to use more spell/trap cards this turn.) I can also recommend to include Stardust Dragon since its really easy to summon with Vaj if needed and it's pretty good for then Yubel decks.
This deck got me to legend for the past 3 months, which isn't too shabby for a F2P deck, is it?
Geez... I only wanted to add stuff concerning Vajrayana, but I ended up with a complete guide on the deck! xD