Beginners often get confused by Parallel cards because they look like completely different cards even though they are the same card. Even if the card number is identical (e.g., OP01-003), check for the star mark and differences in artwork or framing
3 World War Hulk Hulk is big, green, and stompy, and that plays nicely into Magics own green playstyles.World War Hulk is a five-cost Saga that removes the mana cost of your next red or green creature spell (The Incredible Hulk, anyone?)
Just look at this How does one evaluate a card like this in a draft where you can also open Sol Ring, Swords to Plowshares, Flash, Ancestral Recall, The One Ring, Ragawan, Force of Will, Lightning Bolt and all the other very, very powerful cards that are in the Vintage Cube
If this card in the Monster Zone is destroyed: You can Special Summon 1 monster from your Pendulum Zone, and if you do, place this card in your Pendulum Zone
You are rarely neutral about it
Return to the Earth and Ruthless Instincts look like they are interesting combat tricks, but nothing terribly amazing