Nialla, the Savage Flame

Haste, First Strike, Trample

When Nialla, the Savage Flame enters, you may pay {x}. Until the end of turn, Nialla, the Savage Flame gets +X/+0. If X is three or more it gains Indestructible.

The ability to form molten scales gave Nialla an advantage in strength and durability, something useful against those that would invade her territory.