Epic is a trading card game that doesn't use resource cards. Instead, every player has one action per turn (including your opponent's turn). The most powerful cards cost your action and other cards are free. The biggest decision point each turn is usually which card in your hand to use your action on and how and when to use that card.
Each player starts with a score of 30 Mojo. Player's use champion, object, and event cards to try and reduce their opponent(s)'s Mojo to zero.
The game comes in 15 card packs. Each pack is specially sorted and balanced so that you can shuffle any 2 packs together and have a playable 30 card deck.