Good idea to go for the third Laquari, as for Saffira, you need 3 in a CA deck along with 3 Senjus, so unless you have the deck almost complete just focus on gladiators.
Third laquari is optional my gb runs fine with just 2. As long as you have 2 saffira you can stop. You could just use vennu as replacement for 3rd saffira
2 laquari is enough, saffira deck is pretty good. but every tournament we have; a control deck wins. I guarantee the winning deck has sgt electro, floodgate, controller, and wall of d in it