In the common slot, these will be excellent finds for the Dimir player later on in the pack, as only players utilizing deck destruction side theme will be able to get full value
If they're twice as thick as a regular card, it would pretty much be a nonstarter if you planned to mix them with your other cards (like lands)
This is just a Commander upgrade
2 Bloodthirsty Conqueror No Pain, No Gain 5 Mana Cost in Black Creature The only real issue with Bloodthirsty Conqueror is its mana cost, being an expensive card to play in a color with fewer ways to ramp
Once you've landed on an adventure card that falls in the discover range, you can either cast it as normal, or cast the adventure spell if its mana value also falls in the appropriate range
It was the DS' River King: Mystic Valley that we put under the microscope and, surprising nobody, the awful European variant came dead last