RoundsCustomCards

8 original cards for Rounds, built on the same BepInEx + UnboundLib CustomCard structure as Poppy's Chaos / ChaosPoppycarsCards and Pykess's Card Expansion (PCE) — but trimmed to only the dependencies you actually need, and using no custom art (falls back to the plain vanilla card look).

The cards

Confidence level, by card

I built this against the actual source of ChaosPoppycarsCards and PCE (pulled from their public GitHub repos), not from memory, so the card shape (the SetupCard/OnAddCard/OnRemoveCard/GetTitle/etc. pattern) is accurate. But I don't have your game's compiled Assembly-CSharp.dll to check every field/method name against, so:

• Overclock, Bulwark, Ricochet Rounds, Adrenaline Rush — every field they touch (statModifiers.movementSpeed, data.maxHealth, gun.reflects, gun.speedMOnBounce, gun.dmgMOnBounce, data.jump.JumpAction, characterStatModifiersModifier.movementSpeed_mult) is directly confirmed from the two real mods' source. These should compile as-is.
• Second Wind, Vengeful Block — the trigger (Block.CallDoBlock) is confirmed from source. The payload (healing, damage pulse) is left as a clearly marked stub because I couldn't confirm HealthHandler's exact current/max HP field names.
• Momentum Shot, Undertow — the Harmony patch targets (Gun.Fire, HealthHandler.TakeDamage) are my best guess based on how this is conventionally done in Rounds mods, but aren't confirmed. Look for // VERIFY: comments — those are the exact spots to check.

To resolve the VERIFY spots: open your Assembly-CSharp.dll in dnSpy or ILSpy, search for the Gun and HealthHandler classes, and confirm the method names/signatures match. This is normal for Rounds modding — the community's own tutorials all point people at dnSpy for exactly this reason.

Setup

1. Install BepInEx, UnboundLib, and ModdingUtils for Rounds (easiest way: r2modman / Thunderstore Mod Manager, set up a Rounds profile with those three).
2. Copy the DLLs referenced in RoundsCustomCards.csproj (Assembly-CSharp.dll, UnityEngine*.dll, BepInEx.dll, 0Harmony.dll, UnboundLib.dll, ModdingUtils.dll) into a lib/ folder next to this project, or update the HintPaths to point straight at your Rounds/BepInEx install.
3. Change ModId and ModName at the top of RoundsCustomCards.cs.
4. Build (dotnet build or via Visual Studio/Rider).
5. Drop the built RoundsCustomCards.dll into Rounds/BepInEx/plugins/.

Project layout

RoundsCustomCards.cs        - plugin bootstrap, registers all 8 cards
Cards/                       - one CustomCard subclass per card
MonoBehaviours/               - the effect components some cards attach to the player
Patches/CardPatches.cs       - Harmony patches for the block/gun-hook cards

Want more cards, different effects, or custom card art (needs a Unity project

• AssetBundle to build the icons)? Just say what you're after and I'll extend this the same way.