Unlike Earthquake and Fault Line, where a red deck has to wipe its battlefield to plow through opponents, green decks typically lack fliers, so Hurricane leaves your battlefield intact and takes care of any potential blockers
For example, if a 5/5 creature that's also a planeswalker with three loyalty counters on it is dealt 4 damage, it's been dealt 1 excess damage and Aegar's ability may trigger. The History of Excess Damage in MTG The concept of excess damage is as old as Magic, since it's baked into the trample keyword
Another thing is that numerous other cards do the same thing as Polymerization but better
Dragon-type Pokmon typically have moves that require Colorless Energy or an energy of a different type
Because she was a dream, Akroma couldn't die, so the conflict was between a woman with a death touch and a woman that couldn't be killed
What is Obsidian Flames TCG Set