Magic the Gathering has always been a game that many people play but what they don't know it that this game is based on an ancient game based on black magic. The planeswalkers are powerful allies that aid the player in battle but really they are based on ancient players of the black arts game. The arts of the ancient game are only known by a few experts who have chosen to research the game as a career via being an academic researcher. Some of the Magic cards are reprints of the original game, some examples being artifact based cards like Platinum Angel, Darksteel Colossus, Black Lotus, Leaden Myr, etc. Creatures such as Ashling, the Extinguisher (Legendary), Glissa, the Traitor (Legendary), Arachne, The Weaver (Legendary), etc and so on.
Now onto the premise of the idea.
The idea is about two players (Either new to the game or experienced) that end up finding out by chance they are playing a dangerous game after playing a normal game. From this, they awaken and become planeswalkers of their chosen colour (For example, I am going to go Black/Red or as the game says swamp Mountain). Now that they are planeswalkers they can summon creatures, artifacts and spells in real life yet at a cost. The players need to be able to produce mana both during combat and outside combat. There is another cost which will be brought up later in the RP, a very costly one which has been happening since the first summon of a monster. Unlike the game, the effects and abilities they have can target players, none players and creatures in real time. This can cause death, disfiguring, coma's and other real world effects to you and anyone else.
Also unlike the game you are not limited to the number of cards in a deck you can have at one time but will be limited to 4-6 monsters at one time as it is somewhat taxing to the player. With the black arts game now revived ancient players from the past, awaken those of the present and activated those of the future. Since you have released the dark games once more it will be your job to seal it back up, maybe even be the ones to make sure it does not get released again, if it does make sure to seal it again. You will have to think of how Yu-Gi-Oh brought the monsters to life but unlike that show will actually be real and with consequences as well. This is purely fantasy both high and low, possibly apocalyptic, modern, historical in some sense, slice of life in some aspects, romantic if you want it to be there among out things.
Combat it in real time and anyone and everyone is and will be a target so the players, the people in the area and the opponent will need to move in order to stay out of harms way, easier said than done.
Important:
I have stopped playing the game since of early 2013 so I have missed the current stuff and I only know so many of the old series cards. I was a pure swamp, swamp/mountain, swamp/forest, swamp/sea and swamp/light player though mainly the first two. Zombies, vampires, rats, thrills, bats, anything undead and other black evil based things were my thing though not limited to. You don't need to know the game however you will need to research cards and the colours they are a part of as those colours will be the only ones you will be using unless the said creature/artefact is colourless. Liliana was my planeswalkers though I had one other one for the swamp side as well. You can use any card of that colour even from the beginning of the series though you will need to write it in as acquiring it as you will only have limited cards from the get go. Fan based ones are not allowed, though.
Other:
MxF, FxF or MxM (MxM will have no romantic element. Not because I am against it, more so that I have no real idea how to work with it)
Spell Example:
The spell is a mountain (Red) spell, it costs one mana and there for the player will have to use whatever active manner (Of said colour) they have to play it. When the spell is played the spell will target a creature or player which will deal three damage to them. If the creature has 3 defence or less it will die and if it hits the player they will lose life points.
This is important as spells with instant on them will always activate before those that just say sorcery. Each spell will resolve after each other. If several instants are played the last one played will go first and keep going until all spells are used or resolved.
Now the difference between the game and the RP is that Lightning Bolt will hurt you or possibly destroy a monster if it hits. Mana is made within the body of the player and the player can only store about 8 mana points within them, to create more mana they will need to either pay a mana card to boost the number of mana they have available, generate it through monsters/artefacts/spells or by fighting yourself. Mana will not disappear straight away if not used but during each new fight, the mana will reset to one due to the way the ancient rules the game is played. This means you will need to build it up to unleash stronger and more powerful spells.
As you can see in this image the spell dreadbore costs one mountain (Red) and one swamp (black). Since it is not an instant spell, it can be negated if the said spell is on hand. Unlike lightning bolt, it will not damage but kill something instantly and what makes this dangerous is it will target a creature or planeswalker (Player)