-Each player has a card placed in the middle of their board. This card is mostly inactive for most of the match, maybe having passive effects. These cards are similar to monster cards, and have an attack stat, but also have a unique health stat The cards you can use in your deck are determined by the elements attributed to this special card. While these cards are inactive, they can be attacked by monster cards in play, unless you have other monsters in play at the same time.

-The first phase of the game is similar to other card games, where you must use resources to play monster cards and effect cards (Specific details tbd), but with a major unique factor. Nearly every card has a unique "Sacrifice" effect, that when activated moves them from play into the Sacrifice Deck (better named tbd). The second phase of a match begins once each player reaches ten Sacrifice Cards.

-In the second phase, all in play cards are discarded (or sent to the Sacrifice Deck if that is in their effect) and the sacrifice deck is shuffled. The leader monster cards are activated, and fight each other in simultaneous combat. This means that both players draw a card from the Sacrifice Deck, as each card with a Sacrifice Effect also has effects that only apply to the leader monster in this phase. This can be boosts to attack, additional effects, things like that. The two players compare attack power and effects, and whoever loses the fight takes damage. Players continue until one leader monster has their health completely drained, the winner being the one who survives. If the Sacrifice Deck runs out of cards before either leader monster runs out of health, play continues without flipping cards. In the case of a draw, a coin is flipped.

Elements:
Flame (Red)
Ocean (Blue)
Sky (Yellow)
Jungle (Green)
Mountain (Orange)
Night (Purple)
Magic (Pink)
Tech (White)

Example of potential ways this can be used:
The AEGIS Drone monster leader card has 1 HP and 1000 attack, making it very weak. However, its effect lets it gain extra HP and attack for each equipment card with "AEGIS" in its name that is currently equipped to it. There are only 5 AEGIS equipment cards, and they have to be played with monsters during the first phase. Instead of being discarded when the monster is destroyed, they move to the Sacrifice Deck automatically.

When phase 2 begins, the AEGIS equipment cards are played automatically before battle starts, and will remain in effect for the entirety of the second phase. Each equipment card's unique sacrifice effect grant additional keyword for the remainder of the second phase as well. This means that AEGIS Drone only gets five draws, but an incredible boost in power if it can get all five of the AEGIS equipment cards into the Sacrifice Deck.