Having a stable mana base is essential if you want to do multicoloured strategies, and the only way that works is with fetch lands
For starters, its flexible - costing X plus three mana - making it easy to scale up or down accordingly
If you decide to keep her away from the action, she can quest for a single lore - but, again, with the right cardplay, you might be able to send her questing multiple times in the same turn, stacking up a bigger pile of lore
Mind's Eye Could any other artifact make the top spot on this list
With it also having Shift 3, that means that players could potentially play this card pretty early in the game, and it would be wonderful to use in tandem with a card like Pawpsicle, which can be banished to remove two damage from a card