When I get some time (which never happens these days) I might create a specific (community) thread for making the crossover work but these are my initial, 1st draft, thoughts:
Card Deck:
Like in Magic: The Gathering, players start the game with a deck of cards (if they control a Planeswalker). (There is a minimum limit to how many cards are in this deck). If a player that controls a Planeswalker tries to draw a card, but cannot, that player loses the game.
Milling is iconic to magic
Card Hand:
Like in Magic: The Gathering, players start the game with a deck of cards (if they control a Planeswalker). Players start the game with
7 cards from their decks in their hand. After placing order markers at the beginning of each Round (Whenever they reveal an order marker and before taking the turn), that player draws a card. At the end of the Round/Turn, if a player has
8 or more cards in hand, that player must discard down to
7 cards.
Mana: The planeswalker casts spells by tapping lands. Tap a land by placing a tap marker on an adjacent space. The terrain type of that space yields that particular type of mana. If the terrain doesn’t match a particular mana type, the result is colorless. After tapping all wanted mana, the planeswalker casts the spell with cost matching what was tapped. If the terrain is on elevation, bonus colorless mana is gained for each elevation above the planeswalker’s base - for example, If a planeswalker is on level 3 and taps an adjacent grass tile that is on level 5, the planeswalker yields 1G. A planeswalker can only tap an empty space. If a figure ends its move on a space that has a tap marker, remove the tap marker. Otherwise, tap markers remain on the battlefield until the end of round. Before rolling for initiative at the beginning of each round, remove all tap markers from the battlefield.
- Grass = Green
- Stone = Red
- Swamp = Black
- Water = Blue
- Sand = White
Order Markers: function the same as in Heroscape. Planeswalkers have greater function and thus most order markers will generally be on one’s Planeswalker, but if a figure is out of Move range to be tapped, order markers is a viable way. (This is also true if order markers can still order tapped figures). Also, putting an order marker on a squad’s Army Card is a more guaranteed way to take a turn with each figure on that card. A Planeswalker doesn’t need to have any order markers to tap spaces or cast Instants. A Planeswalker does need an order marker to tap figures and to cast Sorceries.
Reserve: Figures that are in your army, but not bought with Points are placed in your Reserve. Some special powers also place and/or start your figures in Reserve. There is no limit to how many figures are in your Reserve. If you have figures in your Reserve but none on the battlefield, you still lose the game. These figures are most commonly associated with summon spells from your card deck. (You might not have to reveal them at the beginning, removing them from your boxes and bags only after you cast them or reveal the card due to special powers.)
Tapping: At any time, a player may immediately place a tap marker on a space adjacent to his or her Planeswalker. Doing so produces Mana; see: Mana. Mana is spent to cast spells and activate some special powers. If any figure moves or attacks, all unspent mana is forfeited - there is no memory mechanic for keeping track of mana. Markers are placed and mana is spent immediately. Once something is tapped, it cannot be tapped again. At the beginning of each round, before rolling for initiative, remove all tap markers. After moving with a Planeswalker figure, that figure’s controller may tap (place a tap marker on) a figure he or she controls that is adjacent to that Planeswalker and take an immediate turn with that figure. If that figure is a squad figure, only that figure and not the whole squad may take its turn. After that turn, the player may continue tapping figures until all figures that are adjacent to that Planeswalker are tapped. A figure that is tapped cannot be tapped again until the next round. (A tapped figure with an order marker on its card may still be ordered?)
(Items in parenthesis I'm not certain on)