Each booster pack contains 15 magic cards (540 cards total)
A lot of strategy comes from optimizing the usage of this memory resource in how you play or evolve your cards in order to "choke" your opponent out of meaningful moves by leaving them with little memory at the start of each turn while you maintain a leading position
Considering this game is already a couple years old, the Online mode wont give a lot of results, so the Single Player option will be the better one
You can only use this effect of "Phosphorage the Elemental Lord" once per turn
I would not be surprised to see some sort of control variant find a good use for this card
A lot of the new cards in this deck bring plenty of support for the monarch theme: Denethor, Stone Seer, Archivist of Gondor, omer, King of Rohan, Champions of Minas Tirith, Forth Eorlingas!, Crown of Gondor, Fealty to the Realm, and Oath of Eorl all bring some much needed support for the archetype, and in varied and interesting ways