The most important ability is it being able to sacrifice other creatures, put -1/-1 counters on creatures and draw cards
(Quick little factoid: Urza's head is one of only a small handful of characters to show up in three different Un- sets.) Urza then showed up as a legendary creature called Urza, Lord High Artificer in Modern Horizons (this portrayed him prior to his spark igniting)
Per MTGs description for the collection, Cast powerful spells, call upon classic summons, and even visit your favorite locations on the back of a chocobo
Now, if you can just find a Dark Ritual and a Skirge Familiar, you can convert your life to cards and cards to mana efficiently
With its thousands of cards, experimental mechanics, and player ingenuity, it is impossible for Wizards of the Coast's R&D team to account for the nearly-infinite possibilities for any card