With that said, when a deck is built optimally, a fetch land could theoretically grant you access to any color of mana desired at the time it's sacrificed
If you want to teach someone how to play Lorcana, or any TCG, you would want to replicate exactly what Gateway does
Red Ramp: Rituals and Temporary Bursts Green has the greatest amount and variety of ramping cards, but red has its own cards that count as ramp, producing treasure tokens or red mana that disappears by the end of the phase
However, it's also freakishly efficient
Target player draws cards equal to the greatest mana value among permanents you control
This kind of disruptive play harks back to Sylveon GX from Guardians Rising, which could use its Plea GX to enact similar retribution