When you get to the late game, giving your opponents some free lands or Treasure tokens is probably worth it to draw a card
For those interested here are the cards that Card Kingdom used to build this rookie deck: Oh before you look at the list and say hey I didnt get this or that card in mine, these decks are subject to change due to availability of cards at the time they build the decks
Honorable Mention #1 (#13 Overall) - Biophagus This two-drop 1/3 can tap for any color of mana to use for anything, so it's already better than the smaller and defender Sylvan Caryatid
Short answer: Yes, Japan Showcase cards are valuable, especially fracture foils
you could activate Kaseto, Orochi Archmage or Crop Rotation a gate into play after your Gateway Sneak is blocked
In summary, this is a Standard all-star like previous Standard all-star planeswalkers, but by itself it is nowhere near the power level of JTMS, and that's fine