This spell also has an alternate cost that allows you to cast it for free if an opponent controls an island and you control a mountain, while costing 3 mana if cast normally
When sideboarding with Mono-Black Control, these are the cards that can be cut for Sideboard cards
The rules change allowed players to announce spells and then announce how they were paying for them, making Lions Eye Diamond kind of like Black Lotus #2, #3, #4, and #5
Like most Magic: The Gathering cards, the value of Core Prowler 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 (Mirrodin Besieged)
Feel old yet
I find it to consistently be a more effective control tool than four mana sorcery speed mass removal (although both is ideal!)