Cards for Weapons
Cards boost your strength significantly when used right. By end game most classes use the same weapon cards. If you're physical and have to worry about ignore defense then you're probably running two Minorous Cards, or maybe Abysmal Knight Cards. If you're a mage the crit from Shell Chepet Cards is extremely powerful.
Until that point you need cards to boost your damage so you can move onto tougher mobs. I've remake this list targeting mobs from level 120 to 180 that drop useful side loot such as rough Elunium, Oridecon, or expensive cards. Unfortunately this means the list of mobs is very short and mostly points out the highest level mobs since there is quite the dry spell from 131 to 165 and unfortunately the only farmable refining resource is Oridecon from Magic Pattern Paper (131). In any case this highlights the cards you're most likely to need or use as you push upward into the higher levels.
I've included the old list underneath in case anyone is interested or running an alt that has not been level boosted.
Please note this does not mean these are the only mobs worth farming. These mobs just have added value since you're farming materials for refinement and materials used by Ancient Equipment at the same time. Drops from alternative mobs don't drop any refining materials and their cards and blueprints are valued at 400k or less. The cards will sell but many of the blueprints will clog up your inventory for months.
Feel free to farm mobs to get their card unlock and deposit as you move onward but once you have these things move back to a mob that drops refining materials because you will need boatloads of them for safe refining... even more so when you need to push further than that...