Whenever players use ink it is expended for that round, with all used ink being refreshed at the beginning of a players turn
Usually, the Shift keyword enables players to place a more powerful version of a character on top of another card - matching the requirements - for a cheaper ink cost than paying the full ink price for the character, as well as immediately putting that character into a readied state
Its a great way of learning to play, getting a few games in, and seeing what cards and decks work well
This means that each of your powerful control spells can do double duty, being castable twice per game, significantly improving their consistency as well as your flexibility when choosing which spells to cast
However, after testing the deck out a bit, Im happy to say I really enjoy this strategy