Put these two things together, and the most obvious answers are Uro, Titan of Natures Wrath and Kroxa, Titan of Deaths Hunger from Theros Beyond Death
While you can't get Set Boosters on MTG Arena, the addition of Play Boosters in Murders at Karlov Manor allow these cards to come to Arena fully for the first time
You can tell the top-down design here, where someone asked: If I design a card to be a moat, what would it look like? It might not be the most powerful, especially when decks dont necessarily need to attack to win, but its still cool and combines well with cards that enable flying
A queen leaves her husband for a man from a rival kingdom, the husband rallies an army, the army does battle with the rival kingdoms forces
There is some planning needed to play a lot of these powerful cards, but they are well worth the effort
It's not bad on curve, or with Coffers and 1st Turn in Type Four with infinite mana but just one spell/turn