If you do go for Greaves, you can use Monk Gyatso as a stand-in for Kitten, providing an alternative route to the same end
Urza, Lord High Artificer Though making a Construct token is arguably the least broken ability on Urza, Lord High Artificer, its enough token generation for it to score a spot on this list
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Tulip - Special Illustration - $35.45: Supporter card for Psychic-type decks, allows retrieval of cards
Youre never going to be all that unhappy to have this in play and it definitely provides you with a good amount of advantage over multiple turns
Pro Tip: Filter sellers by 99%+ positive feedback and "Accepts Returns." Watch for auctions ending late night/early morning for 10-20% below market prices