Witherbloom, the Balancer , is a $14 card right now that can trigger an infinite combo with Sprout Swarm
Considering some artwork of Urza features him without his glasses, I'm going to have to say that this is the canon-iest of the Unglued cards
Ive played many Alesha archetypes over the years
Fable of the Mirror-Breaker / Reflection of Kiki-Jiki Easily one of the best red enchantments in MTG, a powerhouse in Pioneer that also sees some play in Modern and Legacy, and broken enough to warp the whole Standard format around it until it was banned, Fable of the Mirror-Breaker / Reflection of Kiki-Jiki is just plain busted
It's card draw hate to the max, and shuts down entire strategies with literally no effort
This cycle of cards was printed in Future Sight in 2007