What are Kalspire and Malachite good for in Dragonfire?

Two complementary Legendary support dragons:

Kalspire (Champion, Strength 61) — *Tactical Strike*: after its basic attack, +50% tactical damage plus Bleed (30%) on the target and one adjacent enemy. At 6★+ it adds physical damage and Panic. It's an effect setter — Bleed and Panic — that feeds the combos. Green affinity for Cavalry and Shields.

Malachite (Sentinel, Instinct 61) — *Warden's Rally*: +100% tactical damage to one enemy on rounds 2, 4, 7 and 9, and Recovery +70% to 3 allies on rounds 3, 6 and 9. It's your main healer: it restores troops, which keeps your army alive through attrition. Green affinity for Cavalry and Shields.

Both shine in a Shield army (Malachite · Rhysarion · Kalspire, for instance).