In any Pokmon set, theres a number of cards that go beyond the main sets number of cards
One-mana removal will always be of great value, especially in white decks where mana might be tight
Gladion's Final Battle #118 SIR Loading
If high-end Legacy staples arent your forte, then picking up other Reserve List cards may be a more optimal strategy
Some decks such as P.A.C.M.A.N (Pure Advantage Camel Munches All Noobs Yes this is genuinely a meta-threat in Goat format) work entirely off of flip effects, all of which will trigger if you try and run over them in battle
But there is a real depth of creatures to support an aggressive self-mill plan in Sultai: Deathbonnet Sprout, Willow Geist, Urborg Lhurgoyf, Vilespawn Spider, Old Stickfingers, Llanowar Greenwidow and Slogurk, the Overslime all play well