Like most Magic: The Gathering cards, the value of Maester Seymour 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 (Final Fantasy Commander)
You want to be informed when the price of MTG: Final Fantasy - Commander Deck - Limit Break reaches a certain value
Dinglehopper is bad and one that costs one more is probably even worse
Its three mana, and with the mana cheating red does so efficiently, having this land enter tapped isnt as bad as in some of the other colors
Thanks to the increased collectibility of these Final Fantasy promos, they could be worth even more
The latter triggers when you cast a non-creature spell and lets you pay any life equal or less to the Mana of that spell