Another concern is that he doesn't have any way to get damage through, but lots of other creatures don't have evasion and we still find ways to win games with them, so maybe that's not such a big deal
What is their core psychological motivation
Mid Game Deploy medium to high cost Characters before your opponent and apply pressure with high power
Considering that that the green member of the M20 cavalier cycle - Cavalier of Thorns - is currently pushing $20, there is probably still room for Cavalier of Flame (planeswalker stamp) to grow, although right now the green Cavalier shows up in 14% of Pioneer decks while the red one is in less than 4%, which means it's going to take a lot more play for Cavalier of Flame (planeswalker stamp) to get anywhere near Cavalier of Thorns price
(1) Fusion Summon 1 DARK Fairy Fusion Monster from your Extra Deck, by banishing its material from your hand, field, and/or GY, and if you do, it gains 1000 ATK
POP Series 3 Pokemon cards can be a solid investment, especially rare cards in mint condition