If a card feels noticeably thin or flimsy compared to others in your deck, that is a red flag for counterfeits since fake cards are often 1mm to 2mm off in overall size
Cards in different categories help you fill up your inkwell, which means you can put your more powerful characters into play
Cards like Demonic Tutor and Rhystic Study are certainly way up there but when I draw one of those Im often hoping or planning to turn it into a Dockside and win the game. Matt Sperling, @sickofit Dockside occupies the role of Black Lotus (the most absurdly efficient ritual in the format) on my EDH Power 9 list
Similarly, while you do have like three cards that support it, I don't think Zada, Hedron Grinder fits as well here as it does in, say, Feather, the Redeemed
The ability to return the card exiled with Ugin's Labyrinth to its owner's hand just by tapping the land - not even sacrificing it