You can save long-term data to a player's profile through the save action in the effect builder. It is great for creating game modes where the player's progress carries on through multiple matches. Example modes: singleplayer Rogue-like modes, multiplayer arena or battle royale modes.
Select game properties when saving data to profile. Use the dot syntax to select deep into the game. For this action, the context is automatically the game.
player1.hand
player1.maxMana
Saving the cards a player owns.
In some modes, you may want a player to select cards and then carry those cards throughout the game. To save those cards, select their nid and save them to an array. Then save that array.
Saving changes to cards can be done as player or game variables.