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Yes, it costs a good chunk of mana, but late in the game, it can refresh your hand right before your turn at instant speed, giving you a chance to find what you need
By the next day, I was killing on turn three and the deck survived the loss of several other cards prior to a Pro Tour that was dominated by a combination of Grim Monolith and Tolarian Academy
Like most Magic: The Gathering cards, the value of Eye Collector 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 (Throne of Eldraine)
This is offset with the Harrowings, where Valgavoth emerges with a fresh body