The World Cup trophy in Spin a Soccer Card appears to be a craftable trophy item that gives a passive bonus to the card it’s placed on, and different trophies have different effects. In one guide, trophies are described as boosting the card’s beneficial effects, with the bonus improving as the trophy’s star value is upgraded, and maxed trophies can even generate free gems over time.

What it seems to do

  • It is crafted in the Craft Shop.
  • Each card can hold one trophy.
  • Trophies give different benefits depending on the trophy type.
  • Upgrading the trophy’s star value makes the bonus stronger.
  • A maxed trophy may generate free gems over time.

For the World Cup trophy specifically

The available info doesn’t spell out one unique World Cup-only effect, but it strongly suggests it works like the other trophies: you attach it to a card to give that card a passive boost. Since the game’s updates add new trophies and each one can have different benefits, the exact World Cup trophy bonus may depend on the current version of the game.

Practical use

If you have the World Cup trophy, the safest assumption is:

  1. Craft or obtain it.
  2. Attach it to your best card.
  3. Upgrade it if the game lets you.
  4. Watch for increased money, gems, or another passive effect.

TL;DR: it’s basically a card booster item, and the exact bonus may vary, but trophies in this game generally improve the card they’re attached to and can be upgraded for stronger effects.