If a creature is already attacking or blocking when it's detained, it won't be removed from combat
Jodah, Archmage Eternal lets you cheat on costs for anything and Jegantha pays for itself in one turn in the right deck
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.) The ability that defines Brotherhood Vertibird's power works in all zones, not just the battlefield
Like most Magic: The Gathering cards, the value of Snapcaster Mage depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Final Fantasy Commander)
If you are playing madness cards, reanimation synergies, or want a discard outlet for some other reason, the value goes way up