What is that "Dream Card" you get from Ysera?

Solution 1:

Ysera's dream ability actually consists of 5 possible cards. You will randomly obtain one of the following at the end of your turn:

• Dream: 0 mana - return a minion to the owner's hand
• Emerald Drake: 4 mana - 7/6 minion
• Laughing Sister: 3 mana - 3/5 cannot be the target of spells or hero powers
• Nightmare: 0 mana - give a minion +5/+5, destroy it at the start of your next turn
• Ysera Awakens: 2 mana - deal 5 damage to all characters other than Ysera

All of these cards are very powerful. And also considering Ysera herself has 12 health, you will most likely obtain multiple dream cards in a game, making her one of the best Legendaries in the game.