The cost reduction applies only to generic mana in the total cost of instant and sorcery spells you cast
Archaeomancer costs more, but puts the card into your hand, which almost always is better and is more ripe for abuse with infinite combos (infinite turns by blinking it with Deadeye Navigator to return and cast Time Warp, for example)
How to choose where to sell your card, how to package the card(s), how to choose your shipping vessel, and the easiest way to get those to your customer
Question #19: What five-color card has this flavor text
Sin, Spira's Punishment Squall, SeeD Mercenary These Through the Ages cards are also worth splashing: Winota, Joiner of Forces Bruse Tarl, Boorish Herder Kenrith, the Returned King Kraum, Ludevic's Opus Muldrotha, the Gravetide Mythics As with rares, the mythics youll want to splash are basically just bombs
The name is spot on here