Next Tuesday, look forward to my card preview article for the upcoming Universes Beyond release, Magic: The Gathering Assassin's Creed
The artwork does such a great job communicating the horror and pain experienced by the character depicted through tiny details like their twisted hand, the way they are feeling their new porcelain face, and their too-wide eyes giving a look of terror that is contrasted by the blank expression of the mask
In other words, Elvish Mystic cannot generate more than one mana a turn unless some other card causes it to untap
In this case, the free spell lets you (or another player) create a copy of one of your creatures
Rooftop storm is likely one of those cards wed ask people to cut in upgraded precons, as people optimise the manabase, ramp, zombies, payoffs, draw and interaction, a card enabling you to do a bunch of things for free on top of that is likely not healthy to keep for BC once a deck is upgraded
None of these mechanics provided enough novelty to justify the amount of space they would take up on so many of our new cards
