(8/25/2017) You may only put one permanent card from your hand onto the battlefield, no matter how many Dragons you attacked with or how many players they attacked
However, there are likely better options available, such as more versatile removal spells or cards that provide additional card advantage
The real power is in its ability, which can make a spell uncounterable
Storing them in a top-of-the-line binder gives you the peace of mind that your cards are safe from wear and tear, environmental damage like moisture and dust, and accidental mishaps like spills or falls
If the copied enchantment is copying something else, then the token enters the battlefield as whatever that enchantment copied, with the stated exceptions
Legendary Creature - Elemental Dinosaur Cat