The closest I could find to Zarai Dragon is Gawerazu Dragon, it's a 9 cost 11000 Armored Dragon that's a double breaker. Or, it could be Bombazar Dragon of Destiny, which is a Fire/Nature Armored Dragon/Earth Dragon creature, which is a Speed Attacker and Double Breaker, destroys all other creatures with exactly 6000 power, you get to skip your opponent's turn and if you don't win by that extra turn, you automatically lose. So Bombazar is what I'd call something that's not for beginners.
D?o you think that Bombazar's broken or not? Because Wizards didn't bother to nerf (weaken it down to suit the English metagame) it. Personally I think it's not broken. If used correctly, yes it might be broken but it's still vulnerable to stuff such as T-Pit, Spiral Gate, Mana Nexus or Holy Awe. And it's "destroys other 6000 creatures" is more of a drawback than an advantage. The drawback prevents you from comboing Bombazar with Cryptic. Because if Bombazar didn't have this effect it'd be broken as.
Example:
Turn 6: Summon Cryptic Totem
Turn 7: Summon Bombazar, Dragon of Destiny (pretend it doesn't have a drawback)
Attack opponent with Cryptic Totem, it breaks two shields
Attack opponent with Bombazar, Dragon of Destiny, it breaks two shields
Say one of the shields Bombazar broke was Terror Pit. Since Cryptic was tapped, Bombazar wasn't destroyed by T-Pit. That's why Wizards added that effect in. In Japan, it was a different story. Cryptic read that your opponent's can't trigger at all, even when it's untapped. There's your reason.
So now I have made a better way to use Cryptic with Bombazar.
Turn 7: Summon Bombazar, Dragon of Destiny
Attack opponent with Bombazar, Dragon of Destiny (break 2)
Turn 8: Summon Cryptic Totem
Cast Scramble Booster
Attack opponent with Cryptic Totem (break 2, no shield triggers allowed)
Attack opponent with Bombazar, Dragon of Destiny (break 1 left)