Shadowverse is more F2P friendly than many others, especially when new, since 10 card packs are given for each set in rotation with an easily resettable account; that being said, there is typically little variation in the decks one encounters during a given rotation, with more revolving around out-of-hand OTKs than I'd like. There are also enough mechanics that use RNG that the winner of a match can be entirely luck based at times (random target or effect spells and effects being all too common)