I have been waiting for a plugin like this for some time. I can finally switch over from VX ACE as I was using this script. I have a bunch of feature requests.
1). Either a card fusion system where you temporarily combine 2 or more cards in battles like Yugioh Forbidden Memories, Yugioh Duelist of the Roses, or Sleights from Kingdom Hearts: Chain of Memories. Ex. You press the up button to temporarily combine two Fire Cards into a Fira Card (The cards used in the fusion go to the Discard Pile. The Fused Card created is removed from play after use/end of battle (Like how using the Venom Pouch card in the demo to temporarily add Poison Dart to the deck. After use or at the end of the battle, it is removed from the deck.)
2). Many of the older Yugioh video games had deck costs limiting specific cards based on a deck cost limit. Deck Costs/Card Points where each card has a cost toward the deck cost limit. Kingdom Hearts Chain of Memories had a similar card limiting system. Whenever you level up, you can increase the card point capacity by a few points or so. Ex. Your Deck Cost limit is 200 and you add 20 cards that each have a card cost of 10 points.
3). In Wizard101, there are cards that are tied to equipment. These cards are called Item Cards. If a piece of that equipment is equipped, that item card is automatically added to the actor's deck and does not count towards the deck cost limit/deck limit. If a piece of equipment that has an item card is unequipped, then the item card is removed from the actor's deck.
4). Add limits on the number of card copies allowed in a deck. You can use script calls to change the limit.
5). Add Field Spells that can either affect the actor party, enemy party, or both parties
6). Add equipment that dictates things like deck cost limit, number of max cards in the deck, size of card hand, and how many cards are drawn at the beginning of the turn, etc. Ex. You can have a deck item that changes the deck cost limit, hand size from 5 to 6, and add +1 to cards drawn at the beginning of each turn after the first turn.
7). Click on Discard Pile to view cards discarded. Be able to have card effects that can add cards from the discard back to the deck other than reshuffling cards.
8). In Addition to upgrading cards, include progression paths like Wizard101's Spellwrighting System. Collect items call Spellements that can be used as a cost to upgrade certain cards.
9). Be able to click on the discard pile to view discarded cards.
10). Enemies having decks/ use cards.