In addition to an unrestrained desire for power and penchant for monologuing, they also tend to present our heroes with a terrible dilemma: a set of options which all seem bad with no obvious right answer
The options and lower cost that glimmers in Sapphire bring to the table make it a great complement to the slower moving, yet powerful cards in Ruby making them a tempting choice to pair if youre focusing on gathering Lore with lots of characters
The attack trigger also nudges you toward that all-in, keep-coming-at-them style that aggressive decks love
Despite looking like a U/W deck that splashed only the tiniest bit of the other colors, The Deck would reinvent itself after sideboarding, turning into a Blood Moon deck despite having just seven basic lands, itself (and this was obviously long before fetchlands)
Tuck led to people playing even more tutors so they could go retrieve a tucked commander, and wed like to encourage a lower tutor count