here 1 more strategie that tsubasa and me found xD
in 1v1 a rush with nekro can be very usefull or very useless... tsuba and me did 1v1 and i made much snipers...i only saw his ronin and i though ill win easy but his nekro came and 10 snipers cant do anything against nekro spirits and zombies...
in 2v2 its usefull too if all serpent ...ur partner stop all atk with tower and smoke and u build nekro as fast u can... this is very funny if the enemy is surprised and try to kill nekro but snipers arent strong enough and nekro get healed... but if enemy rush its useless so scout before everytime