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Okay I'm going to try to list everything we have so far. Items in blue are terms that may change if we think of a cooler name.

CARDS
There are 3 types of cards: Monsters, Spells and Items.

Monsters The battle force of your army.
Name
Clan: The archetype. (In YuGiOh terms Gravekeeper's Assailant would have a name Assailant and a clan Gravekeeper)
Type: Soldier, Dragon, Machine, etc.
Element: Fire, Dark, Wind, etc
Rank: It's level. A 0 requires no sacrifice, a 1 requires 1, a 2 requires 2, etc.
ATK/DEF: It's offensive and defensive powers.
Effects: Written Condition, Cost, Effect.
Description

Spells The magic you can preform.
Name
Type: Action, Exhaust, Location, etc.
Element: Fire, Dark, Wind, etc
ATK/DEF: Only used for spells that can become monsters.
Effects: Written Condition, Cost, Effect.
Description

Items Your armoury.
Name
Clan: The clan, type or element that can use the item. If blank it can be used by any monster.
Type: Trap, Weapon, Building, etc.
Effects: Written Condition, Cost, Effect.
Description

Terms
+ Ready: A card is ready if it is facing straight.
+ Exhaust: You do this by turning a card sideways.
+ Stunned/Set: This is when a card is put face-down.
+ Fast: Similar to Spell Speed 2 & 3 cards in YuGiOh.

Other Rules
+ Rank 2 Monsters can be played by sacrificing one Rank 2 monster.
+ Rank 3 Monsters can be played by sacrificing one Rank 3 or one Rank 2 and any other Monster.
+ When you attack you must exhaust the attacking monster. (Must be Ready)
+ Set/Stunned monsters cannot be attacked.
+ When your opponent attacks you can Exhaust a ready Monster to add it's ATK and DEF to the battle. The Monster you Exhaust takes all the damage from the ATK up to it's DEF then the left over is used against the attacked monster.
Example. A 5/4 attacks a 3/2. Defender Exhausts his ready 1/4. The 5 ATK from the attacker destroys the 1/4 but doesn't do enough to destroy it's target. The total 3+1 of the Defenders destroys the Attacker.
+ You can only do the above once per battle. The attacker cannot exhaust to add to their original attack.
+ The attacker can exhaust more than one Monster to use their total ATK against a single Attack target. Has to be done on the initial announcement of attack.
+ Attack points can be used against more than one monster. You must select monsters once at a time to deal damage. (So you have a total 10 ATK to spread across monsters with DEF of 5, 4, 2, 3. You'd have to pick a monster and do all that damage to it before the next. You cannot do 4 to the 5 and 3 to the 4 as you can in Huntik)
+ You can only set cards from your hand in your End Phase.
+ You cannot play cards from your hand or activate set cards during your End Phase unless it is Fast.