Can you come up with an original Magic the Gathering card in the colours blue and green?
Sure, here's an original Magic the Gathering card in the colors blue and green:

Name: Verdant Growth

Type: Instant

Mana Cost: {U}{G}

Description: Target creature gains +2/+2 and trample until end of turn.

Card Text: "The jungle came to life as the spell took hold, the creature's muscles and bones growing stronger with each passing moment."

Flavor Text: "The power of nature is a force to be reckoned with."

Rarity: Common

Illustrator: John Avon

Card Number: 12345

Set: [Set Name]

Card Type: Instant

Mana Cost: {U}{G}

Description: Target creature gains +2/+2 and trample until end of turn.

Card Text: "The jungle came to life as the spell took hold, the creature's muscles and bones growing stronger with each passing moment."

Flavor Text: "The power of nature is a force to be reckoned with."

Rarity: Common

Illustrator: John Avon

Card Number: 12345

Set: [Set Name]

This card is an instant spell that gives a target creature +2/+2 and trample until the end of the turn. The card's flavor text and illustration convey a sense of the power of nature, while the card's name and description provide practical information about its effect. This card would be a useful addition to any blue and green deck that relies on creatures to win the game.