Champion costs goes 1 gold to 5. The champions you can buy are off your EXP. EXP is a stat you can buy.
The champion pool is shared. Meaning that you can deny drafts by grabbing a champion.
if you burn your gold on rerolls early your going to get dicked if you fail to grab what you needed.
Its a deck building game. Its about economy and knowing when to burn $ to make your comp as well as transitions to later into the game.
If you just pray for RNG gods to save you your shit at the game mode and deserve to lose Hella till you figure out the fucking basics of the mode. Building a comp, plan for being able to adapt. Pick items or champs with impact during roulette rather then something shiny and higher tier.
its not complicated.