Maybe? This is my first F2P in 6 months, so it is grabbing every one of those hooks in me.
I have unlocked the five basic heroes and found the Trophy Hunter which is good. Allows you to turn the Rare boss skulls into exp / renown for your heroes.
Still enough replay to try and unlock everything within each mission, though I need to do that at higher skill difficulties.
And crafting… so many mats, just need to make some calls and start building some cards!