This creature while not as strong or mana-friendly compared to the other vortex evos,has abilities simillar to a como of Crystal Lancer and Stall ob, the life squash er.
First let look at what the card reads:Vortex Evolution - Put on one of your Merfolks and one of your Chimeras. This creature can't be blocked. Double Breaker (This creature breaks 2 shields). When this creature leaves the Battle Zone, destroy all creatures in the Battle Zone.
The best part of the card is that its very hard to be spiral gated/terror pitted/natural snared/destroyed without risking all creatures in the battle zone!This effect can be combined with nature's "when this creature would be destroyed be it in your mana zone instead" creatures.
Sadly,like all vortex evos,it needs two creatures to votrtex it.if your opponent destroys the chimera or merfolk your plans are foiled.its ability can be a double-edged sword for examplelayer A has 5 creatures while player has none.If player A summons Cruel Naga,and breaks 2 of Player B shields,however,Player B has a shield trigger:spiral gate.Foiling Player A chances of winning