Hearthpwn

       Nobundo   (7 characters in name, "7" in text, 7 words in text)

Clarifications:

• Crystals gained are not all 7, but just the ones above the current number. Crystals gained are full.
• Coin ruling: If Nobundo is cast on T4 with the Coin, for example, it would dissipate at the end of turn as per usual as the adjustment would be inclusive of the coin, leaving the caster with 6 Mana Crystals after their turn, the opponent with 8 Mana Crystals after the beginning of their turn.
• Overloaded Ruling: pre 7 Overloaded Crystals are treated normally and remain locked. Crystals above 7 in a state of Overload can be removed, but Anticipated Overloads would still be in effect (Possibly affecting the 8th Mana Crystal a turn later)

 His stats are slightly inflated because of the advantage to opponents when cast on T4 or T5.

Hey this is my submission, Paladin class card, Terenas Menethil, 7 attack, 7 Health and 7 words text:

Flavour text: Look now to your defenses,  for the champions of justice gather at your gates!

4+3=7 and 3+7=10, if the card activates it's Battlecry it it turns into a 7/10. The most harmonious card ever made.

The sevens are the number of words in the statistics, the number in the statistics, and the health.

Note: You must have 8 cards in hand and then use the card to activate the Battlecry, just as it happens with the Twilight Drake.

7 mana cost, 7 letter name, and 7 in the text. 

A risky card that has the potential to be very powerful in decks with an overall high mana cost. Could lead to some lucky (or not so lucky) draws.

"Despite being a world breaker it cannot break a Nokia."

My thinking was since Piloted Sky Golem is epic this one had to be legendary to keep the rarity of these accurate. Being able to summon itself on a deathrattle is legendary.

• Cost: 7
• Attack: 7
• Card Text Includes 7

Clarification: It is referring to the combined cost of the 7 cards, not the discarded ones.

7 cost, 7 attack, and 7 in the card text.

7 is my favorite number.

This sure was a tough competition haha! I think I finally came up with something worth submitting. Its effect is kind of like a mix between Sap and Recycle but with a body and a higher cost. It can be used to disturb your opponent's draw or just get rid of a pesky minion!

Balance: It might seem unbalanced but the thing is; Recycle is awful so power creeping on it isn't hard. Also this will only get rid of big, pesky minions like Ragnaros for one turn unlike Recycle.

Flavor: The minion grabs another minion ( preferably a goblin ;-) ) and drops it off on top of your opponent's deck.

Enjoy and please vote ^^

7 mana - 7 attack - 7(Shahraz)

My Entry: Druid of the Wild.

Edit: Got image to work finally. Removed attachment.

The card meets the following requirements:

-A Mana Cost of "7"
-A Health of "7"
-Exactly 7 words of card text

For more info about Lore and Design Choices, See the Spoiler Below.

Edit: cost 8 > 9

"The dead are only gone to those who choose to ignore them."

Your opponents cards too! This card will Revive the mill decks! 

-Edit: Wrong entry, meant to enter this.

• 7 mana
• 7 health
• 7 in card text

Unlike the bombers, this will never target the heroes.

7 Health 7 Mana and Name is 7 characters.

Ancient of Wind, if someone still remember it.

7 cost. 7 letter name. 7 toughness.

Rogue Spell: Practiced Maneuver

Rarity: Rare

Effect: Deal 7 damage. Combo: Give your weapon +2 Attack

Flavor Text: Practicing is good; however, to improve oneself you must perfect your technique.

Lucky Sevens:  7 costed spell, 7 words in spell, number 7 in spell

Hello guys, this is my first entry ever, hope you like... I made this for Mage because i think that every hero need some and maybe it's well balanced :)

Images credits to YAORENWO

Flavor text: "It is now as it should be... -Spirit of Earth"

The card text a bit long. But 7 mana, 7 card characters and contain 7 in card text. 

edit: card ratity