While it can be effective in certain situations, there are potentially better options like Swords to Plowshares or Path to Exile that offer more versatile removal
Only some of the languages that the game offers are Japanese, English, and Portuguese
Plus, English cards are sold internationally
The Kewl Tune deck is full of Tuners and Synchro Monsters you can use to summon Zalen, and with Kewl Tune shooting to the top of the format, Zalens price has been shooting up too
Pair him with the Sphere Grid Enchantment which gives you a counter every time you damage a player, and it really starts to feel like the game
Kestia, the Cultivator is a Bident of Thassa that you'll always have access to if it's your commander but does require some work