There's red= fire, blue= water, yellow= electric, green= grass. The confusing part may be gold and yellow, you can tell something is gold by the darker sections inside the card such as here:

compared to yellow:

other than that there's diamond which should be different enough.

Then there's radiant versions of the 4 creatures, infurno has a blue fire, zappit is yellow instead of orange, walle is pink instead of blue and wrackoo is purple instead of green.