This card has always done so much work as it is almost always cast off of a elemental or large Tireless Tracker
If you want to find an Expedition, just buy a Draft, Set, or Collector Booster display box, and you will find them
Blitz (If you cast this spell for its blitz cost, it gains haste and "When this creature dies, draw a card." Sacrifice it at the beginning of the next end step.) When this creature dies, if it dealt combat damage to a player this turn, return it to the battlefield under its owner's control
For as long as Secret Lair cards remain this difficult to get ahold of, both at and after release, price spikes like Geralfs Messengers are likely to continue.
As you might suspect, these Secret Missions are harder to complete by nature and require you to collect the rare cards in each set
It deals damage equal to its power to target creature an opponent controls