Dragons want as many Treasure tokens as possible, as they have high mana costs, so the extra mana is very helpful
In addition to being basically a Fusion-Equip-Spell Card, the card also has a die roll effect where when the Monster it's equipped to battles another, you roll a 6-sided die and your opponent's Monster will be banished for that many of your opponent's turns until the first Standby Phase after the last turn of the effect
Each Modern Horizons 3 Play Booster includes one, giving Draft even more to explore again and again
What at first seems to be a flavorful uncommon that helps Blue decks ramp a bit quickly spirals into a rules rabbit hole once you ask a simple question: How does she work with Clones
Removal like Mortality Spear, Anguished Unmaking, and Infernal Grasp keep threats in check, while protection pieces like Shalai, Voice of Plenty and Swiftfoot Boots safeguard your key creatures
For Gandalf specifically, it helps that he was a powerful wizard, which opens up itself to lots of fun card designs, and that his character evolves significantly throughout The Lord of the Rings, Turian explains