Valorous Steed is basically a beefier - and slightly more expensive - Gallant Cavalry and Imperial Aerosaur makes creatures fly over your opponents' heads time and time again
If you don't, you spent six mana to barely make an impact, and if you do, you could have just won without it by casting another creature instead
We'll look at the regular versions, since those are the most likely to show up
Commander is a multiplayer format built around a single legendary figure, and FF has its fair share of those
Both were chase cards in their respective sets, but the Umbreon has a PSA 10 population of only about 700 compared to the Pikachu's 3,000+
Then, Kenrith has other great abilities depending on which other color(s) you happen to be, each of which put you way ahead