This isnt a new idea Arena is the 15th video game based on Magic , and depending on how you count it, the third or the seventh to attempt to replicate the feel of the actual card game, rather than some other genre hung vaguely on the fiction but Arenas free-to-play business model sets it apart
Complete guide to Mega Evolution Base Set full card list, chase cards ranked by market price, and where to buy sealed product
The Amethyst/Steel starter deck already has a pretty solid foundation, as it includes many of the Madam Mim and Merlin cards that form the bounce package
You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any type to cast that spell. Basically, you can pick the best thing someone else owns and then cast it yourself
I can understand, based on the 13 cards that carry the mechanic, why it wasn't more popular, but with the right setup of graveyard interaction, this mechanic has every chance to come back bigger and better in a future set