Magic capacity is increased through power cards (transformations~~), and must then be filled using cards that generate magic. It reminds me a little bit of rogue in Hearthstone, but taken to the extreme.
This often leaves you with turns where you have to carefully plan out the order of your plays, which I greatly enjoyed. The main mechanic of the mod is teamwork: if a Sailor Moon card is played before a teamwork card, the teamwork card benefits from an additional effect. The visuals of the mod are incredible, with each card having art from the TV series, the playable character model being adapted from Sailor Moon video game, and many effects being accompanied by beautiful particle effects and in some cases the supporting cast as well. Lovers of the franchise will be very happy with the inclusion of a huge roster of central characters. The Senshi is a Sailor Moon inspired mod centred around increasing your magic capacity, then storing up magic and empowering your attacks and skills.