If you control 2 or more Dinosaur monsters and your LP is lower than your opponent's: Destroy as many monsters on the field as possible, and if you do, take 1000 damage for each monster destroyed, then inflict damage to your opponent, equal to the damage you took. Until the end of the next turn after this card is activated, neither player can Normal or Special Summon.
How to Get
Destroys your Monster Cards / Destroys your opponent's Monster Cards
Prevents your Normal Summons / Prevents your opponent's Normal Summons / Prevents your Special Summons / Prevents your opponent's Special Summons
Damages you / Damages your opponent
But since your lp has to be lower...and you take the damage before your opponent, wouldn't this card lose you the game if you took enough damage?