Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by revealing 3 other "Cubic" cards in your hand with different names, and cannot be Special Summoned by other ways. Unaffected by other monsters' activated effects, whose original ATK is 3000 or less. When this attacking card destroys a monster by battle: You can activate this effect; this card can make a second attack during this Battle Phase. During your End Phase: Each player takes 3000 damage. You can only use this effect of "Crimson Nova the Dark Cubic Lord" once per turn.
How to Get
Reveals your hand for cost
Unaffected by Effect Monsters
Cannot Normal Summon / Cannot Set / Nomi / Special Summons itself from your hand
Damages you / Damages your opponent
don't realease Geira Guile the Cubic King and game is ok :)
You really think that people wouldn't find a way to abuse this card? Keep in mind, that we also have skills in this game. I'm pretty sure that there would be a combination to do an easy FTK if you go second.