You can play one Land per turn
Instead of having archetypal Tuner monsters, "Swordsoul" cards instead have effects that Special Summon a Level 4 "Swordsoul Token" Tuner monster, which greatly increases the Deck's consistency compared to other Synchro Decks as there is no longer a need to search for Tuners
It's...probably not necessary
The unique quality to this mechanic is that one choice, that of drawing a card, is consistent from card to card
The two that I wasnt entirely sure on was the Dragonite and the Venusaur
When multiple of these effects are on the field, you can use the likes of Ghostly Flicker to blink both, return Flicker and an extra card to your hand, and repeat this sequence over and over again, which can be a pain to interact with if the second spell is a counterspell