Canyon Slough and Dragonskull Summit are your best for black-red, while Fetid Pools and Drowned Catacomb are the clear winners in blue-black
When one half of the split card is a land with the ability to come into play untapped, nearly all of the risk is eliminated, assuming your mana base can support single-colored lands
If you Fusion Summon a DARK monster while this card is in your GY (except during the Damage Step): You can banish this card from your GY, then target 1 card on the field
Most major marketplaces, including eBay, allow you to create saved searches for specific cards, grades, and price points
While staff members definitely won't be in tears due to the slightly lower value, an almost $500 card is a pretty great consolation prize
On eBay the lowest list is $1.14 and that seller actually loses money if that sale goes through