The Cards
Who's to say what card's the one? None but you and I as the battle's begun! So prepare--my friend--for what's to come.
Dragon Spirit - Lvl 3
Another Lvl 3 gem. With immunity to status effects, flying and high speed I use this spirit in many matches as a frontline or backline hitting post. Hard to hit and at a 3 mana cost it's perfect for poison matches, earthquakes or an opponent that leans to melee/ranged.
Enchanted Defender - Lvl 5
A foil promo grants 20% extra DEC per win and this one has slipped into my regularly used cards, particularly in the equalizer matches where it's health can be boosted, at lvl 5 it's common and comes with thorns and can be a literal DEC mine as well as a prickly tank.
A rambling of opinions