My Lands: Black Gem Hunting

i have a hero and i have chosen a scout. he is level 4 now and has a +100% chance to find artefacts in ruins. how much chance does that really give?

im looking through artefact sets and have liked:

templar set level 3 ( im an elf so useful )

suicider set level 2

sniper set level 2 ( i use alot of archers )

monster slayer set level 2 ( my friend ozzy16 has it and he says its great )

which set should i choose ? and with an estimate at total black gems cost of the set. thanks

For the chance to find artefacts, see this thread.

As for sets -- to be honest, unless you're very lucky, you get what comes, and there's little choice involved. My heroes have a set each: Elven and Armoured Warrior. They're not what I'd have chosen, but (unless you're going to spend a lot of money on BGs to buy sets ready made from the vault, or even more expensively, piecemeal from the vaults) you'll slowly build up your sets from ruins, quest rewards, tournament rewards, and the occasional piece from the vault.