I started thinking how long it would take to actually complete a collection by simply paying money, here are the numbers(might change on release):
Max purchasable amount of coins:
50€(same with dollars) = 7,200 coins
or
100€ = 14,400 coins (simpler math)
Each week you can only buy a certain amount of wildcards each week from the store with coins:
champion = 3 x 400 coins
epic = 3 x 150 coins
rare = 6 x 40 coins
common = 6 x 15 coins
3 copies of a champion a week(so 1 complete champion) x 24 unique base set champions = 24weeks
24weeks x 7days = 168days
and for cost: 3 copies x 24 champion x 400coins each = 28,800coins
28,800/14,400(100€ of coins) = 2
2x100€ = 200€
Here are the results for the other rarities:
Time:
Epic: ( 3 copies x 36 unique epics ) / 3(amount each week) = 36weeks = 252days
Rare: (3 copies x 108 unique rares) / 6(amount each week)= 54weeks = 378days
Common: (3 copies x 150 unique commons) / 6(amount each week) = 75weeks = 525days
Cost:
Epic: 3 max amount of copies x 36 unique epics x 150 coins = 16,200 coins
Rare: 3 max amount of copies x 108 unique rares x 40 coins = 12,960 coins
Common: 3 max amount of copies x 150 unique common x 15 coins = 6,750coins
Full collection cost: 28,800 + 16,200 + 12,960 + 6,750 = 57,960
57,960/14,400 = 4.025 = around 400.25€
Bonus:
To max out on store wildcards each week It'll cost you:
3 x 400 + 3 x 150 + 6 x 40 + 6 x 15 = 1,980coins
1,980/14,400 = 0.1375 so around 14€ each week
for you to keep on doing this each week for a year it'll cost you:
365 days each year / 7days is around 52.4285...
52.4285... weeks x 1,980 coins is approximately 103,808coins
103,808coins/14,400 = 7.2089...= which is around 720€
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