how much will i have to pay to max an ability card, and is it worth?

[manic lintel]

?

[blissful pasture]

starts at $50 (except first ability card)
$350 for level 2
$500 for level 3

100% worth it in the long run

[forest vortex]

it is worth, like example iron lung /fmo lvl 1 -2.5% DR lvl 3 10% Dr