Yes, absolutely! All new players are given 70 individual cards (140 cards in total) that make up the Welcome Set for free. These are prebuilt, editable decks that give players an idea of how the six gods differ from each other.
Players are also given an allotment of Core cards on top of this to start off with which can be used to enhance your decks. But don’t let these contain your play-style! There are far more ways to play than these, and you can unlock packs and cards just by playing the game.
Leveling up by winning (or losing) Ranked games or participating in events will reward you with card packs, allowing you to customize and expand your decks further.
However, please keep in mind that cards with Plain quality are in-game items only, but you can fuse copies of cards together to upgrade their quality with the Forge, turning them into NFTs. After that, you can then trade them for ETH (or other types of tokens) on Immutable X or other supported Marketplaces (TokenTrove, AQUA) in order to gain the cards you are seeking to complete your deck.