proxy mtg cards Hornet - Stoneforge Mystic | Hollow Knight if you cast it Arcane Proxy

Several of these spells care about the number of Lessons in your graveyard, which turns the discard on Black-Green +1/+1 Counters Arm your creatures with +1/+1 counters through a variety of means

Black Lotus Adds 3 mana of any single color of your choice to your mana pool, then is discarded

Nightmare Moon / Princess Luna provide an interesting multiplayer functionality by making friends while also referencing Nightmare Moon's affinity for the night and cards with Moons on them (Blood Moon, anypony?), and Twilight's abilities are obvious as the Princess of Friendship even if there aren't any Applejack, Fluttershy, Pinkie Pie, or Rainbow Dash cards to go with her yet (this means Wizards needs to get on the ball!)

Despite both printings being shadowless, usually only the 2nd printing is referred to as shadowless, as it is easier to differentiate the 1st printing by its Edition 1 logo

You will keep that counter even if Toph, Earthbending Master dies

Whenever Suki attacks, create a 1/1 white Ally creature token that's tapped and attacking