Ideally, we would remove some of the fringe mechanics like Myriad and Vanishing, but it's good to know what they do, and the cards that utilize them are fairly straightforward
Mangara is also a Cleric, so a Cleric Tribal deck like Ayli, Eternal Pilgrim
Did you try to balance them against one another for that
This was one of those cards that a lot of decks were on the edge of playing, either because they couldn't quite get threshold reliably or they didn't want to splash one of the colors, inviting them to play a high-risk but high-reward game with their mana bases that both cost them games and won them games they had little right to win
Meanwhile, there was a separate card called "Embalming Chamber" that reduced embalm costs
Getting a Gem Mint 9.5, especially with 10s in centering and edges, is a mind-blowing grade