The Ozolith There are a gazillion cards that put counters onto permanents, but cards that move those counters around arent so common
Esper Sentinel | Illustration by Eric Deschamps Human is a creature type, and one of the most used ones
Surprisingly, Invasion of Shandalardoesn't have any restrictions on the permanents you can Regrowth, which means in a graveyard deck, you can set up some absurd value loops by using the battle to return two permanents and another copy of itself to your hand and then doing that again the next turn, but this is pretty slow
For example, ten cards use artwork previously found on Vanguard cards, depicting legendary creatures from early Magic lore
These help get Millicent on board early and often, which is fairly important to getting the most out of your creatures