gengar pokemon card trick or trade New RarityHolo Rare Hit Points130 HP Darkness 🎃 Trick or Trade is

Niv-Mizzet, Parun and the emblem from Teferi, Hero of Dominaria are two good examples

Or, oops, a Blightsteel Colossus

Ive excluded [casthaven]Gemstone Caverns[/casthaven] (which essentially lets you turn being on the draw to being on the play), [casthaven]Urborg, Tomb of Yawgmoth[/casthaven], and [casthaven]Vesuva[/casthaven] since they dont produce multiple mana (but can when combined with lands on this list)

While Dockside Extortionist and Nadu were being looked into and were known to be problematic cards, a lot of fans were taken aback by the sudden ban of Mana Crypt and Jeweled Lotus

This is still a powerful card, and it's possible it might see some niche play in the sideboards of blue decks that don't have access to board wipes

Mega Gengar EX prevents your opponents from using Trainer cards, which is a major component of any well-built deck