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The Entwine dragon has just been released, with a specific breeding combination.
Love + Sweetheart
There are 5 elements in the mix; plant, fire, earth, cold & lightning.
So many fails, with 138.5% of set breeding chances. The 2.5% chance of breeding Entwine drops to 1.81% This means 39 attempts are required for a 50/50 shot at getting one. And the 14.68 hour average fail time equates to 23.85 days of non stop breeding.
Cloning an Entwine
The Entwine dragon shares the same 5 elements as the Sweetheart dragon, so the only fail that is actually saved is by not cloning the Love dragon. As always, when possible, I recommend cloning with the 30 minute Poison dragon.
There is a slightly higher total set %. But Entwine has a better cloning chance of 4% which becomes 2.75%. 25 attempts required for a 50/50 shot at breeding one in the CBC. The shorter average fail time of 13.57 hours translates to 14.14 days for an even money shot. During the 7 days Entwine is available, you will average 13 attempts, which will give you 28% chance of breeding one. Spending some gems to speed up some fails will certainly help your chances. And the cheapest fails to speed up will be that 6.87% of Poisons. My recommendation for getting an Entwine dragon is
Poison + Entwine