This card may look ridiculous at first sight, but there is actually a really neat combo that allows Charix to attack for 19 points of damage. Here's how it works:
It's simple and only requires three cards, but its upside is tremendous. If your opponent does not have targeted removal, it's basically game over.
Raging Isle could also be used in Mono Blue decks and White-Blue Control decks that need a good blocker and an occasional attacker.