The cards will start appearing in France next week, but a US arrival hasn't been confirmed.
Other copies have had a bit of a spike in price recently, so a reprint of this frog commander is well-timed
Karlach, Tiefling Spellrager would fit well in an aggressive Izzet (blue-red) deck that focuses on quick damage and spell synergy, utilizing its first strike and haste to pressure opponents early
Physical Japanese Pokemon cards are tangible assets: SARs sell for $50-$500+, PSA grading can multiply value 3-6x, and you own them permanently
The primary structural risk is supply
Blossoming Tortoise Eliana: This card already fits nicely into a lot of Golgari and Abzan lands archetypes well, but the coolest line of text in my opinion is after the first more lengthy paragraph