Not only is Tiana able to quest for two lore, but as long as Tiana is exerted she has an automatic defensive mechanism that a challenging character has a negative three to their attack unless the other player pays three ink to counter it
That being said, since there are much more affordable variants of these cards available, their prices hardly follow the norm
They make for awful late game topdecks, but they can fix your colors and accelerate out a 4-drop on turn 3, which is something nearly every green deck is interested in doing
The main takeaway is this: SPE cards are really valuable, MAR reprints are mostly good, while Marvels Spider-Man (SPM) is just okay in value, outside of a few rares and mythics
Based on the latest market prices tracked on TCG Stacked, Summon: Bahamut is worth about $39.73 USD for a regular copy and $53.79 USD for a foil copy
Each landfall on your turn triggers it, but so does looping the channel cards in the deck on opponents' turns so that the lose three life option of Monument can be chosen repeatedly in a turn cycle