Multani, Yavimayas Avatar and Bone Dragon offer large late-game threats that you can have access to without Atzal, Cave of Eternity
Like most Magic: The Gathering cards, the value of Urza, Lord High Artificer 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 (Mystery Booster 2)
Whats Driving These Prices Three factors sustain OP-01s trajectory: Supply contraction : OP-01 is long out of print with no reprint planned
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You could also Donate a permanent to an opponent that hurts them over time, but if they flicker it or if the effect somehow returns the card to you, you might end up stuck with the negative effect again