Defining Card of Each Element

[Xenocidius]

The title says it all. What do you think is the defining card of each element?

Pick a card that you think perfectly represents the theme of the element. The card should be simple, and probably will be one of the earliest cards. Do not pick the most popular one. It does not have to be commonly used. Can be upgraded, not, or both. For cards with the same effect either way, use the most common name (or both).

My picks:

: Lightning - the quintessential CC card, perfectly represents Aether's electricity theme
: Thunderstorm - the defining mass CC card
: Steal - perfectly represent's Darkness's theme of crippling the enemy while strengthening oneself
: Poison - simply yet deadly, the perfect example of Death's poison usage
: Titanium/Diamond Shield - the most powerful vanilla shield in the game, perfectly showcases Earth's defense
: Chaos Seed - perfectly demonstrate's Entropy's randomness
: Crimson/Ruby Dragon - the strongest (highest base ATK) creature in the game, yet incredibly fragile
: Momentum - need I say more?
: Heal - see above
: Holy Light - I'm not sure about this one, but still
: Electrum Hourglass - simply a brilliant card, thematically and balance-wise
: Freeze - the very essence of water

[coinich]

Wouldn't the Featured Card Articles give you an idea of what the defining card for each element is?

[Xenocidius]

The featured cards article shows the most popular cards - not the most thematic/elementally fitting ones.

[Pineapple]

: Phase Shield
: Eagle's Eye
: Eclipse
: Bonewall
: Basilisk Blood
: Discord
: Rage Potion
: Titan
: Mitosis
: Hope
: Rewind
: Arctic Octopus

[zse]

I'll add only the ones that aren't on Xenocidius or patchx94 lists.
  Enchant Artifact
  Explosion
  Miracle
  Permafrost Shield
and
  Supernova

[Aves]

Dimensional Shield- Nothing gets through it. Except explosions. And momentum. And Steal. And all spells. But you get the point.
Shockwave- Air was made to do lots of cheap, low-medium powered damage.
Drain Life- Using the life of an opponent against them.
Vulture- Strength from death.
Stone Skin- Earth is strong, and adding up to 75 HP really shows toughness.
Mutation- Strength through chaos.
Rage Potion- The Sacrifice of HP for Attack.
Otyugh- Gravity gets bigger. and bigger. and bigger.
Emphatic Bond- Life is creature spam.
Miracle- The awesome (old sense of the word) power of light.
Precognition- Speed yourself up.
Has no defining cards... Inundation/Purify don't really represent the rest of the cards, and the rest of them don't really represent the full depth of water.