Zedruu is extremely mana-hungry as you need lots of mana to both play your cards and donate them with Zedruu's activated ability of UWR
I say relative savings, because it would be unrealistic to expect anything to be below MSRP at a time like this - getting close feels good in the current landscape, though
If this card is sent to the GY by card effect: You can target 1 of your Level 4 or lower "Lunalight" monsters that is banished or in your GY, except "Lunalight Emerald Bird"
the 21 rare (39.7%) and 9 mythic rare borderless scene cards (8.7%)
And my favourite interaction of all, Fiend Artisan can fetch Grist, the Hunger Tide, an alumn of last years Top 10 list
Its a combination of forest and mountain terrains, so it generates a green or red mana for the player each turn