Poison counter Commanders like Fynn the Fangbearer want proliferate cards to help them get their opponents up to 10 poison counters to close out the game
When a Town controlled by the owner of the exiled card enters, sacrifice this enchantment
If the equipment itself is destroyed then the reconfigure creature goes to the graveyard
Furthermore, third-party enthusiast sites like TCGplayer or even grading services such as Professional Sports Authenticator (PSA) have indexes that allow you to see, perhaps most importantly, the historical trends of raw and graded card prices
Such is the case with Darkrai EX anyway, so consider switching one Nihilego for Giratina EX, giving rise to a new brand of the notorious DarkTina set (DragDarkTina, anyone?)
This legendary yeti naturally strengthens his offense for a minimal mana investment, so defensive measures will be your primary concern once he arrives to the battlefield