Nice question, Warrior!

Here are some information regarding the Heroic Cards:

Once you reach a warzone that has Heroic cards, you can start earning them just like the other cards, but with a much lower chance. Heroic cards are really rare, but in due time you can earn one! Also, keep an eye out for special offers and prizes that may contain a Heroic card.

Here's a list of Heroic Cards:

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Card Name: Colonel Warcry

Warzone: 5

Energy: 4

Category: Human

Card Name: Flare Major

Warzone: 6

Energy: 3

Category: Human

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General Name: Dwight Eisenhelper

Skill: Adds one extra soldier in trench and smallbunker.

General Name: Tokubetsu Kamikaze

Warzone: 5

Skill: Flying vehicles will explode when destroyed, dealing massive damage.

General Name: Leonidash

Warzone: 6

Skill: Revenges a lost main building by deploying an entire army.

General Name: Paul von Minenfield

Warzone: 6

Skill: Adds 15 landmines on your side of the map.

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See you on the battlefield!

Over