Whether it is the right tool for you, in a deck you build or in a game, is largely going to be a function of what is useful for you at the time
As far as Moxen are concerned, though, this card is very narrow
This is especially true when this cards unblockable status depends on your opponent controlling a Swamp, which they might not
It looks really nice, and is available on the showcase version of every three-colour card in the set
When you have too many cards in your hand, make use of spare Event cards such as "OP11-060 Let's Crash This Wedding!!!" by trashing them for Nami's [On Your Opponent's Attack] effect, similar to a Counter, allowing you to keep your hand size below 7 to activate your Leader effect
Purphoros might be more Bracket 3 speed, so opting for an Impact Tremors instead might slow your roll a little