You need removal already to beat their early Winding Constrictor starts
Are you going to take all the Swamps by leaving the rotting corpse of a multidimensional eldritch machine god to spread out and consume everything it can
Rumor Gatherer has incredibly obtuse creature typing for most aggressive white decks, but if you do branch out into GW or the Jeskai sphere youre sure to enable tribal synergies
You can see and download that here: The pret file has been updated such that it can be understood by humans
Those strategies are cards that gain value from discarding (especially lands), cards that can allow you to play many lands, landfall, and cards with leaves the graveyard triggers
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