Warping lets you cast a spell quicker than normal, but with the cost that it'll disappear at the end of your turn
The same artwork, often in better print quality, for less money
While none of these cards offer much versatility, they can each fetch you something helpful
Trainer cards and basic Energy from the shadowless run also lack the picture-box shadow and use the thinner type, so your binder can show mixed versions if you built it from random lots
"Elemental HERO Solid Soldier" and "Liquid Soldier" are good monsters to Normal Summon, as they can Special Summon needed "HERO" monsters (usually "Shadow Mist" or "Stratos" for their on-Summon Trigger Effects) and can generate more advantage if they are used as material for the Fusion Summon of a "HERO" Fusion Monster
Obviously, Commander, as the format was eventually called, went on to become the largest tabletop format