In some cases, you can use Sinkhole to destroy a site, set your opponent back, and if your opponent isnt careful with where they cast their minions, you can follow up with Cave-In , Stormy Seas , or Earthquake to remove multiple cards from the realm devastating your opponents board while setting them further behind in board presence
This never answers anything permanently (except tokens), but its pretty hard for things to go wrong with Master Xande on deck
You can ideally get two or three cards off the top of your deck, assuming you dont hit multiple lands, and you could even use explore to manipulate this a bit
There's the Field Notes cards (first introduced in Bloomburrow ), along with Power Poses inspired by the show's opening theme
Lo and Li, Royal Advisors Lo and Li, Royal Advisors are mill on demand, very similar to Oona, Queen of the Fae