Sword & Shield, the latest Pokmon TCG expansion, has arrived
Chase cards from Mega Evolutions and other Pokmon TCG sets are available now at TCGPlayer
Looking back now, 5 mana is an awful lot to ask of an enchantment that doesnt do anything when it enters the battlefield, but if allowed to sit on the battlefield after a board wipe or a couple turns of play from an Aristocrats strategy (decks that derive value from sacrificing creatures), Black Market can quickly generate game-winning amounts of black mana
Graveyard Hate Relic of Progenitus and Surgical Extraction are both top 20 cards (overall) in Modern, with their main purpose being to hate on graveyard-based strategies
This website contains a link to the most up-to-date version of the Comprehensive Rules
Generally if you are in green and know you are playing against a heavy artifact deck at some point you will throw this in as it will really help out in that match up and be fine the rest of the time