Nino N' Xander

Requirements:
- Nino that can double Ursula, not hard to achieve. Robin (F) can be used as well.
- Vanilla Xander, will work even in 4 stars.
- Any healer, i personally use Lissa because of her extremely useful support healing skill.
- Azura, or any dancer. Level doesn't matters.

-Strategy-
Note: Starting positions are, Xander at the bottom, Nino at the right, and the rest doesn't matters.

Turn 1: Put Nino in Ursula's range, out of the ninja range. She should be able to KO her (remember, your Nino needs at least 37 speed!)
Turn 2: Move Nino to safety, and move Xander into the way (one tile to the right.)
Turn 3 and going: Xander should be able to tank the hits of the Sword Cavalier, and the Ninjas as well. Homewer, the Sword Cavalier does high damage to him, so be sure to heal him each turn, then move the healer out of the ninja's range with your dancer.
When the Sword Cavalier has low health, KO it with Nino, then attack any ninja, Xander will normally KO each in two hits. But keep in mind that you need to stay blocking the exit, otherwise, a ninja could sneak off and KO any other unit. When you KO both ninjas, KO the Axe Knight with Nino, with a little help of your dancer.
Hope it helps!

Nino

Xander

Lissa

Azura