Japanese cards have a more niche (but growing) demand outside Japan
The strongest starter deck in terms of competitive potential is Black Marshall D
." Number 135 Language English Legal Formats Alchemy, Brawl, Commander, Competitive Brawl, Historic, Legacy, Modern, Pioneer, Standard, Timeless, Vintage Rulings (6/6/2025) The cost reduction applies only to generic mana in the total cost of red spells you cast
If Sprite Dragon resolves through a turn or two, it can be pumped up with multiple cheap spells
One of the earliest, and most successful, of these merchandising ventures is the Pokmon Trading Card Game
While only getting the full use of your lands every other turn is a huge downside for this effect, cards like Seedborn Muse or Wilderness Reclamation trivialize it, ensuring you can put out huge creatures that your opponents will struggle to deal with while avoiding the risk of leaving yourself open to do so