Simple rule: NEVER
include a card in your deck that, if played against you, is likely to destroy you.
This existed even before mindgate, with a small variation: NEVER
play a card that, if played against you, is likely to destroy you.
Example: don't play your Lobo aginst Decay, don't add MFlayers to your forest spirit deck (you are not Elidnis
![Laugh :))](https://elementscommunity.org/forum/Smileys/solosmileys/laugh.gif)
), careful with Discord in you mono entropy, etc.
There are exceptions, but you'll find it easier to stick to the general rule for a while.