Banning these seven cards is a small stepand one that some, including Harmon, see as overreachingand does very little to fix the cultural and structural issues that Wizards and the larger Magic community have with race
Before the various Portal and Starter sets became legal, the biggest pushback against their inclusion in various formats was that two amazing cards would get added to games and warp metagames and such -the horsemanship ability, which was essentially unblockable, and Jungle Lion
Not only that, Velomachus Lorehold is a huge dragon with flying, vigilance, and haste
Green also has lots of effects that care about creatures, including the best tutors like Worldly Tutor and Green Sun's Zenith and cards that benefit from having creatures like Rishkar's Expertise
Unsurprisingly, this hasnt left many copies on the market, but things wont necessarily always stay that way