Like most Pokmon cards, the value of Rellor depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Paldea Evolved)
I heard that the "slow lands" (i.e., Deathcap Glade, Sundown Pass, and so forth) may be reprinted, and it would be nice, but I still would prefer to see reprints of the enym-colored "check lands" (i.e., Hinterland Harbor, Isolated Chapel, and so forth), since the original printings of those cards are the only printings that feature the original artwork and are also available in foil
Zendikar is when we start seeing the land aspect of full-art lands tie in with the set theme
During either player's Main Phase or Battle Phase: If your opponent controls a monster and you control no monsters: You can Special Summon this card from your hand
Aromaseraphy Rosemary gives 500 ATK to all plant type monsters on your field