In order to make a great investment, we want to invest in cards which have: Low sentiment Low metagame percentage (relative to potential) Low format interest in the formats they're played in (relative to potential) The last two points are related to the dynamics and trends in the Magic marketplace
Additionally, if you have a full party, youll get to put a +1/+1 counter (as well as giving them deathtouch) on each creature you control at the beginning of combat on your turn
As the deck is so important to have as a smooth redundant selection of cards working towards the same end you cannot afford many slots at all for slowing down people's clocks
The most expensive card in Gem Pack Vol 1 set is the Captain Pikachu Art Rare
Thanks to vigilance, you'll have the option to crew them again on your opponents' turn to act as a blocker
Black/Red: Noncreature Spells (Aggro) As the saying goes: theres more than one way to race a chocobo, and theres more than one way to play a noncreature spells deck