I havent found a list worthy of showing off, but I do think these are the best cards at attacking Abzan along with the rest of the field
Also note that cost increases always apply before cost reduction
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
It's not bad on curve, or with Coffers and 1st Turn in Type Four with infinite mana but just one spell/turn
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
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