Dan_The_Noob wrote:2. species A gains all buffs from species B
3. rain card which makes enemies faster
I don't think anyone would want to copy 2 or more buffs from one monster on to another, though I have thought about cards like this. As for the rain, the new Blood Rain does something like this
AstartesCitizen wrote:I would like to see more card buffs and debuffs for the player and the weapons as it has been mentioned
It is very difficult to come up with player debuffs that could potentially work across all mods that aren't unfun and are mechanically possible in the engine. Here's my philosophy when trying to come up with a new card:
1.
Will it work with most Doom mods? This is the trickiest one. If it effects a monster, would it work for every custom monster and not just vanilla Doom 2 monsters? Player/weapon effects are the hardest, as there's no telling what powers a custom player class will have or what kinds of jank the weapons are using to function. If you understand what's possible in the engine you'll know how limiting things can be if you try to cover as many Doom mods as possible. Things like "Your x weapon fires more slowly" or "Monsters resist plasma weapons" just aren't feasible given how many variables exist for custom weapons/classes.
2.
Is it fun to play against? Try to imagine the card being forcibly picked for you in chaos mode. Does it make the gameplay more challenging or just plain miserable? This can vary depending on the effect, but an idea that comes up a lot is "x monster has more health". This effect isn't that fun in practice, making monsters extra spongy isn't that interesting. However, spawning an additional monster which is basically doubling the monster health
is interesting because that second portion of the health now has its own body, moves around and can be dodged.
3.
Does this effect already exist in some way? I try not to make filler cards that essentially do the same thing mechanically, mainly because I want the card choices to always feel like an interesting decision (or if you're playing chaos mode, not getting practically the same effect over and over). This is why I haven't added like 10 different debuffing effects to monster projectiles, because they all equate to the same thing: Getting hit by x = more bad.
Having said that though, you could disagree with all these and make your own cards. If you know a little zscript (or are a zscript upstart!), it's pretty easy to add new cards. If you're making cards with a specific mod in mind, you could go absolutely nuts with ideas.
I am happy to keep taking ideas though, as I'm running out of them myself. I like the idea of adding new mechanics/actors that aren't too complex to mix up the gameplay, but don't have many ideas at the moment.
I could have used it for the wad I just started. 
Especially players looking for secrets with line triggers etc.