Crusader. The card itself fits light, but the ability does not. Indeed, it is a parasitism kind of ability. Those are the ''thing'' of darkness.
I disagree, because Crusaders are soldiers being led by an Elemental, similar to how the the Crusades were supposedly led by brave kings and whatnot. Light is Not Necessarily Good (
http://tvtropes.org/pmwiki/pmwiki.php/Main/LightIsNotGood), and it was common for supposedly righteous knights to break the code of chivalry behind people's backs.
Fate Egg. Random hatching? That's
to the max.
IMO, it seems more like we don't know what's in the Egg and that we're spending time to
age it rather than random transforming a la Mutation. Randomness can be present in other Elements - since we have no knowledge of what it's an egg of and Time is not necessarily predictable, you just have to go with the flow and see what the Egg will become.
Alternatively, the Egg is what all Elements creatures start out as and they evolve based on their personality instead of the environment.
Fahrenheit, Fire Bolt. Fires don't get stronger, they die out.
...unless you're feeding them more energy (Aka Fire quanta), in which they do grow bigger.The usual Fire player has a bunch of pillars to add more energy to compensate energy lost.
Spark. Aether has many lasting, immaterial creatures and the ability to make them immaterial. Yet the only creature that doesn't last for more than one turn or can benefit even slightly from immaterialness (unbuffed) in the entire game happens to be Spark. Most of it's synergies lie outside of Aether and it's usually not used in decks based on aether quanta (outside of Sparktal maybe). Both Fire and Death seem more appropriate for it.
Aether has electricity - note that most Aether cards are high cost which could imply concentrated energy. Spark might just be a loose tidbit that can't sustain itself with it's amount of energy (it costs nothing after all).
Throwing this out here for discussion:
Jade Shield : As ak65la once put it, it's a "dark horse" of Life - it's resistant to the usual CC and PC that are Life's other common weaknesses and even turns spells against the user. Life's usual defense is healing back the damage and spawning more creatures, so why is a sturdy magical shield in it's arsenal?