"SpellTable Joins Wizards of the Coast"
Donald Duck Ghost Hunter has good stats for his cost
However, thanks to its face Commander Bello, Bard of the Brambles, you can transform some of your Artifacts and Enchantments into creatures on your turn to have them bring the pain to your opponents (and give you some sweet card draw)
Excalibur II's low casting cost and inherent interaction with life gain effects could earn it a slot in some decks that interact with their themes, since it transforms any creature into an immediate threat in a few turns
Little warrior slash and brawl, be born again to free us all. Illustrated by Matt Stewart Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
Peak Value: $5,000$7,000 USD (est.) (BGS 9) Why It's Valuable: A unique artifact from Antiquities that untaps lands, enabling powerful mana-generating combos