Vito, Thorn of the Dusk Rose, Marauding Blight-Priest, Vizkopa Guildmage and Cliffhaven Vampire are the most mana-efficient options for redundancy
I really like the MDFC cards such as Ondu Inversion, Shatterskull Smashing, Hagra Mauling, etc
If it becomes day or night or if a daybound permanent enters the battlefield, track day/night for the rest of the game
Lands your opponents control with the chosen name lose all land types and abilities, and they gain ": Add one mana of any color." "A rare and fascinating phenomenon." Tamiyo Card Details Set Core Set 2019 (M19) Rarity rare Colors R Artist Alayna Danner Collector # 128
For making your own decks Disney Lorcana Illumineer's Trove Looking to create a deck of your own, and provide a really solid foundation to build on