As "Swordsoul" usually relies on their Synchro Monsters to interact with the opponent's cards, mass removal or negation such as "Dark Ruler No More", "Lava Golem", or "Raigeki" can easily neutralize whatever monsters the "Swordsoul" player ends their turn with
Ragost has a great rate for dealing direct damage to each opponent and turns each of your artifacts into a potential Boltwave
(9/24/2021) Although the Human tokens created by the triggered ability are attacking, they were never declared as attacking creatures (for the purposes of abilities that trigger whenever a creature attacks, for example).
If you only ever adapt this once, its still two mana to reanimate an opponents creature, stapled to a hatebear
Purchasing starter decks and booster packs is a great way to begin, as these offer a good mix of cards that can be used both for gameplay and as the foundation for a collection
Right now, there's only, like, four battles that have abilities worth protecting from