Elemental Dragons sound... RNG?
Elemental dragons sound like a really cool idea, but it also sounds like it introduces a whole new level of randomness to the game, and not in a good way.
E.g. you've got a great late scaling team comp that wants to play passive early. Water/Air dragon spawns and you're great as it doesn't hurt much when your enemy gets those buffs. Earth dragon gives them a chance to end a bit earlier though. Fire dragon lets them scale harder than you and really hurts a lot.
E.g. Your team relies on MS boosts to engage. A few air dragons suddenly help the enemy team get away a lot easier.
If you don't know what type of dragons are going to spawn before the game starts, how can you create an appropriate strategy?
I think it would be more fair to have the dragons spawn, but rotate in a set order. E.g. Fire dragon spawns, then turns in to a Water dragon at the first point it's out of combat after 4 minutes, then Earth after 6min, Air after 8min, fire at 10, etc... You need to time when you start contesting Dragon to make sure the one you get is the one you want.
I'd just hate to start seeing players complaining that they lost a game because they picked a siege comp and only got fire/air dragons, etc...