Card types:
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Base Summon Card (1 cost, empty summon, 1 HP by default)
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Base Weapon Card (1 cost, empty weapon, 1 ATK by default)
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Base Spell Card (1 cost, empty spell, does nothing)
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Summon Modifier Card (applies new text to a summon)
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Weapon Modifier Card (applies new text to a weapon)
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Spell Modifier Card (apploes new text to a spell)
20 HP per player 30 card deck, 2 copies max except bases, which have 6 copies max
Summons are monsters used in the game, and attack the opponent using weapons. Spells are effects that you can cast any time you have the mana available. Cards are discarded to create two mana to play summons, spells and weapons. Weapons stay on the field when the wielder is killed. Modifier cards apply unique effects to base summons, spells and weapons. Modifiers are applied to other cards while they are still in your hand, and remain stuck to the card for the duration of the game.
If you try to draw from an empty deck, first shuffle the discard pile into the deck. Each turn begins with 6 cards in hand. Play continues as long as you can play cards. When you end your turn, discard your hand and draw a new one.
Notes: Base cards could have a maximum number of "slots" for modifications. Different combinations of cards could create "Combo" summons, spells and weapons, sort of like following a recipe. Some of these could simply be discoverable by the players.
Example deck:
6x Base Summon ([1], 1 HP, 3 slots) 6X Base Weapon ([1], 1 ATK, 3 slots) 6x Base Spell ([1], Choose a target., 3 slots)
2x Shield ([+1], Summon Modifier, An attacker must attack this summon before attacking it's controller.) 2x Shell ([+1], Summon Modifier, HP +2) 2x Spikes ([+1], Weapon Modifier, ATK +1) 2x Crystalize ([+1], Spell Modifier, Discard for +1 extra mana) 2x Spark ([+1], Spell Modifier, Deal 1 damage to the target.) 2x Frost ([+1], Spell Modifier, If the target is a summon, it can't attack next turn.)
Combos:
Twinrova (Base Spell + Spark + Frost, Deal 5 Damage to any target. If that target is a summon, it can't attack next turn.)