Instead of reducing their opponents health to zero, in Disney Lorcana both players are racing to be the first to reach 20 lore, acquired by questing with cards and using certain abilities
Its effect to pay the top card of your library is easy to accomplish and can be done at instant speed, so even if you have removal for Urza, the effect can be used multiple times before it ever resolves
Most importantly, as a colorless Artifact, Crucible of Worlds can slot into any deck, regardless of color identity
While they can mostly only be used while on the battlefield, you should read the ability and look for clues as to when its supposed to be used
Pippin even has a cheeky ward 1 to help keep him alive a bit longer, since this ability makes him a must-kill if your opponent wants to have any chance of winning