Which cards I rented to get to Bronze I

_{If you don't have that many DEC to spend and can only buy 1 or 2 cards, this is definitely the one to go for. At the time of writing it costs about 3 DEC per day renting this card. Gives the thorns ability to ALL of your cards, that is whenever one of your cards is dealt a melee attack, this card does damage back to the creature attacking it.
This ability, in my opinion, is particularly powerful especially in low-mana matches where it is sufficient to select cards with the greatest Health/Mana cost ratio (among the Earth ghost cards you have from the start: Hill Giant, Failed Summoner, Mycelic Morphoid, Harvester)
For this very reason, I recommend Mylor Crowling to those who have a low or no budget to spend: you can safely use this summoner in a pure ghost card deck and, playing wisely, it will allow you to get up to Bronze II, even if you only rent 1 card: Mylor Crowling.}

_{Not as powerful as Mylor Crowling and needs more skills to make use of its ability but it's even cheaper. You can rent her for under 1 DEC per day.
Divine Shield allows all of your cards to avoid the first attack. This can become a huge advantage in the Bronze League. Imagine adding a Truthspeaker and an Armorsmith to the team (warning: only in games with not too low mana cap) and your survivability will be very high. Light Splinter is full of cards that give buffs. Be wary that the problem with this splinter is exactly not to overdo with the buffs available and then realize that you have too few cards dedicated to attack enemy ones.}