It can be searched from the deck by Gateway to Chaos.
You can normal summon this card without any tributes.
Very strong stats when summoned without tributes.
Can only be normal summoned when this is the only card in your hand.
Weak stats for a 2 tribute monster.
Removing cards from hand
Swift Gaia the Fierce Knight has a great synergy with Wonder Balloons. Send cards from your hand to the Graveyard until Swift Gaia the Fierce Knight is left. By doing this, you can reduce your opponent's monsters attack and you can use Swift Gaia the Fierce Knight's effect which is you can normal summon it without any tributes.
Flash Assailant is a good monster to be partnered with Swift Gaia the Fierce Knight, since it can obtain its maximum attack and defense by having no cards in hand.
Searching from deck
Currently, we can only obtain 1 copy of Swift Gaia the Fierce Knight which makes it hard to draw. By using Gateway to Chaos, you can easily search it from your deck and add it to your hand.
Balance Your starting hand will reflect the card balance of your deck.
If they only give you one copy it wouldn't be too good. It would be good but not broken, cause in some match ups it just wouldn't be useful, for example burn cause in burn they don't really summon so his special effect doesn't work and you'd never have enough tributes on the field.
I actually have 3 copies... from Yugi, from Duel-A-Thon and from exchanging green EX orbs with the trader on Crowler event... I got lucky actually...