Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle
Each Prerelease Pack includes: six Draft Boosters, one foil-stamped R/M card from Innistrad: Midnight Hunt , three DFC Helper cards, one Day/Night Tracker, one Spindown life counter, one deck box, and one MTG Arena code card
This one is the much more interesting question
If they don't, you draw two cards
It lets you tuck away a card with hideaway and then rewards you with Treasure tokens whenever you cast multicolored spells
Rather than sticking to Islands so that High Tide is good they go for the more redundant and continuous replacement of Heartbeat of Spring, Mirari's Wake and even Mana Flare)