Currently my favourite card in scrolls has to be Iron Whip, it's versatile and low cost. Whilst a very new card, being one of the recently released energy cards, it can really pull it's weight.
The general usage I find for it early game is the 1 poke damage, useful for removing memorials and Sister Of The Fox. By removing these 2 early on you can slow a growth deck down significantly by removing targets for an early Fertile Soil.
The...