The determining factor, instead of mana, is the number of dragon creatures in your hand
Ornithopter You knew it was coming sometime, but it was just a question of where
So it will NOT negate the effects of 'Sangan', 'Witch of the Black Forest', 'Black Pendant', 'Giant Rat', 'Mystic Tomato', 'Kuriboh', 'Graceful Charity', 'Sinister Serpent', 'Marie the Fallen One', 'Buster Blader', 'Shadow Ghoul', 'Helpoemer', 'Sword of Deep-Seated', 'Vampire Lord', 'Coffin Seller', and 'Magical Thorn'
Greninja ex SIR from Twilight Masquerade ($354) Water/Dark ex Ninja starry SIR art
Deoxys also makes a strong showing as one of the best cards in Plasma Freeze from both visual and value points of view
Wizards of the Coast stopped printing efficient land destruction like this years ago because, well, it turns out people actually like playing their spells