For a f2p team any fire blitz or anbu lightning setup would be good. For fun with a partner in group v AI events, you can make a blitz itachi team with earth main light bolder, and have your partner run edo sasori and bee, cast light bolder, wait for itachi to attack twice, than cast bee, wait for the attack again, than cast sasori. Boom round 1 finish for basically all Ti.

Note that the viability of this tactic goes way down in pvp environments were frequent interrupts that are present and the predictable nature of the cast order.

Most ninja can be gotten for "free" given enough time and focus, this was shown with someone got s Itachi without spending. Most p2w ninja are defined as such due to combination of expense of resources and limitations of acquiring. Tendo pain is no longer p2w since he is free for any player on a decently along server due to ultimate training changes, while red hot kushina is still restricted to where she pops up in weekly events. P2w ninja is still a loose term, though you can set a general rule that it's a ninja that you actively seek out, and converted coupon cost to get immediately is in the range around and above 10k.