The same is true of the delve mechanic and the Phyrexian mana mechanic, and while neither of these mechanics ended up needing to be banned while in Standard, both are right on the border, and one slight miss could lead to major problems and bannable cards
Thawing for further analysis. Meltstrider log, final entry Illustrated by Samuel Perin Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Niv-Mizzet, Dracogenius, Niv-Mizzet, Parun, Niv-Mizzet, the Firemind, and Niv-Mizzet, Visionary
Path to Exile No to that Theres a theme for most of the spells on this list, and thats that they only cost one mana
If Faunsbane Troll is no longer on the battlefield or no longer a creature when its activated ability resolves, it doesn't fight the target creature, but the effect that causes the target creature to be exiled any time it would die that turn still applies