Havent won this yet but there are 2 main ways of getting Ankhs to complete it in the most fastest way.
first way of getting the Ankh is buying it with Diamonds that can be found either on a run OR with the Supply Drop which happens each 6hrs.
second (and more dependent on luck) way , is getting Ankhs from supply drops. the most I got was 10, so if anyone could confirm you could get more - would love that.
EDIT : DueAsh in the comments can confirm it may go as high as 18 Ankhs, thanks :)
EDIT 2: DerParol05 confirmed you may even get up till 20 ankhs.
for the actual resurrection - i recommend reviving only ONCE PER RUN. since the Ankh cost for each resurrection raises each time. so if you resurrect with it costing 1 - its much better than having to resurrect 3 times and waste 6 Ankhs.
hope this helps :) .