Day 4 of a beginner

Whatsup people ??

Today's not a great day and decided to not spam lots of game and recharge my capture rates ( was about 60% ).
The daily quest was pretty bad ( 6 DEC ), I was wondering if and which chance there is for dropping any card.

I was thinking on focusing on some rents for Death's or Earth's levelled up decks, should I focus on cheaper summoner or spend little more even withouth gettin the DEC back in the rented days ??

Have a good day!