What units to use as games goes on

[rollems]

ok i just got Call Collosus on BOLO. but when i used the spell it gave me just 3 ogrs. am i doing some thing wrong??? how to get the dragon ????

got it if i goto debir and use the spell i get Ent. if i use in scarlet/rusty i get green dragon. if i goto verona and use it i get a giant. if i use it in Bolo i get Orgs
so now which one u suggest
my current situation is in screen shot. i just unloacked verona/rusty. stole few flags here and there from those islands. have killed all on scarlet and almost all on bolo.
so what army shall i get/drop now ???


also when i play i notice every one tries to attack the repair driod going around gaurd droid. and attack it while i have wasted stone skin on gaurd droid.