This works with all permanent types, and means that if you sacrifice a treasure token, you not only get the mana from the token itself, but Korvold gets stronger - and you draw a card, too
Creating an army of Drake tokens allows you to attack the table on two fronts, building your board presence while ensuring you have more cards than your opponents
While the play patterns around cards like Uro, Oko, and Arcums Astrolabe are far from my favorite, these cards dramatically altered the balance of power in the format without just adding or aiding linear combo a rare feat in Moderns history
Did I miss your favorite deck
Satoru Umezawa makes it so that every creature card in your hand as ninjutsu for one black mana, one blue mana, and two generic mana