It can work especially well with Thassa, Deep-Dwelling, giving you a chance to proliferate multiple times each end step
The most expensive Magic card ever sold is a one-of-one serialized The One Ring from the Lord of the Rings set, bought for $2 million by Post Malone
No matter how you manage to get it onto the battlefield, the raw card advantage and board presence that it represents is somewhat unmatched among other big creatures
Discarding an island is just much more difficult than discarding a blue card, especially with greedy mana bases, but its still doable
The art of Magic: The Gatherings Bloomburrow set is top-tier but the incredibly rare Raised Foil Anime variants are a cut above
This tutor is made even better by the fact that Stoneforge Mystic is a creature, and also can put any equipment from your hand onto the battlefield for just two mana, possibly avoiding high mana costs, and making it a versatile threat on its own