Well, if it's a Deathrattle that destroys the game board, just make it an 11 mana 0/0. If it just clears the board, you have to ask yourself if destroying every minion is too strong or too weak. To give an example, Bittertide Hydra is a 5 mana 8/8 that deals damage to you when it takes damage. If your minion is strong, the drawback is strong. If the effect is strong, it means you give it a poor statline for its cost. Anomalus is a good example.
Twisting Nether is 8 mana. If it's a deathrattle, it would make sense to activate it close to 8 mana. 3/3 would would make it easy to pop while not a big threat. It also wouldn't die to a low-atk minion/taunt, so it's not a given that it would pop.
How would a card with the text above have to be statted in order to be balanced?
0/0
4 mana 7/7?
Well, if it's a Deathrattle that destroys the game board, just make it an 11 mana 0/0. If it just clears the board, you have to ask yourself if destroying every minion is too strong or too weak. To give an example, Bittertide Hydra is a 5 mana 8/8 that deals damage to you when it takes damage. If your minion is strong, the drawback is strong. If the effect is strong, it means you give it a poor statline for its cost. Anomalus is a good example.
Come visit my Card Emporium. Strange things, you will find inside...
Come take the test, if you're daring. Feel free to show me your results in a message.
I'd make this an egg, something like 6 mana 0/8, would be close to twisting nether for Warlock who can easily destroy his own minions
7 mana 3/3.
Twisting Nether is 8 mana. If it's a deathrattle, it would make sense to activate it close to 8 mana. 3/3 would would make it easy to pop while not a big threat. It also wouldn't die to a low-atk minion/taunt, so it's not a given that it would pop.
This seems fair to me.
How about 8 Mana 8/6 deathrattle: deal 8 damage to all minions? That's practically a board clear and really seems like a feasible card
whoosh
Anger is the punishment we give ourselves for someone else's mistake.
If it's neutral, might enable a control variant of deathrattle hunter.
Just make it very expensive. It's basically a worse version of a spell that does the same thing, so 8 mana on adecent body.
Note that Cataclysm does the same thing as a spell, so if you make the card discard your hand as well then you can make the minion very cheap.
One does not simply walk into Mordor,
unless they want to be the best they can be.
8 mana 3/3. Druid class card.