>Was it easy because you had endless meat shields?
Pretty much, in the beginning it was a bit inconsistent but after the first gate or so I could summon so many things, I also had two companions who could each summon a bat. Then the mana thing that gives 1 mana per unit and the one that heals 3 and reduces all cooldowns by 1.
Since basic attack is just 1 cooldown I was able to tank hard with my knights / have all of them attack / fully recharge mana / have everybody attack again.
Also I'm not sure if this is intended but you can move -> summon knight on mana point -> instantly have the knight consume the mana point and draw a card, disregarding summoning sickness.