The border that is used for Japanese Pokmon Cards are made up of neutral colours (white, grey)
It's a fun way for the whole family to learn it together, with 3 decks and easy to follow game instructions
You pay the cost, discard that card, then can search your library for a card with the same mana value as the card you discard
However, Jeskai Fires naturally plays exclusively (or almost exclusively, depending on the exact build) cards that cost three or more mana anyway, with the plan being to fall behind on the early turns but catch up with sweepers and powerful creatures on Turns 3 through 5
For you, this translates into immersive, action-packed safari experiences with fewer crowds
In BO1, you can have a very explosive draw with Leyline of Resonance in your hand, and a fast aggro start that ends the game as fast as turns 2 or 3