How do you powerup cards for Lyath to 13 or more?

I've used lots of cards, but am usually behind by 4-5 power to use the 'Tower' cards (13 or more usually).

So I ask - how do you powerup cards for Lyath to 13 or more?

I've tried using a bunch of auras, smaller powerups like [[Revolting Gesture]], and now I just use [[Towering Titan]] (Red).

It takes quite a lot to do it for 1 attack.