It seems a bit weak and unnecessary. While the idea overall could work, it seems unnecessary when Nightfall's already a +1/+1, and Eclipse is a +2/+1. The fact that they don't have the absorb cost, while this does, means that without the candle, its worth is highly questionable.
With Candle, it seems a little better. However, again, requiring 2 cards for a +2/+2, or at best, a +6 with itself included, and also requiring a swarm to get use out of it at all, combined with the maintenance cost, makes this a bit weak. I wouldn't buff the numbers, but I'd either allow for better targets, or lower/change/remove the maintenance cost.