In the end, it was killed because we decided that we didn't want to force players to track down specific versions of cards for tournament play
Mutant Menace has everything you need in a precon
Dark Confidants downside is negligible in these matchups, and while it doesnt interact itself, it does ensure that you see enough cards to be able to present the necessary quantity of interaction while still consistently pressuring their life total
What about the other two upsides
Now all you need to do is cast Trazyn and give it haste, then it can immediately make infinite black mana
Arclight Phoenix Ashcloud Phoenix Aurora Phoenix Bloodfeather Phoenix Bogardan Phoenix Chandra's Phoenix Detective's Phoenix Everquill Phoenix Everquill Phoenix Firestorm Phoenix Firewing Phoenix Flame-Wreathed Phoenix Flamewake Phoenix Forgeborn Phoenix Immortal Phoenix Jaya's Phoenix Joshua, Phoenix's Dominant Kuldotha Phoenix Lamplight Phoenix Lightning Phoenix Magma Phoenix Managorger Phoenix Nemesis Phoenix Ozai, the Phoenix King Pang Tong, "Young Phoenix" Phoenix Chick Phoenix Down Phoenix Fleet Airship Phoenix of Ash Phoenix, Warden of Fire Rekindling Phoenix Retriever Phoenix Screeching Phoenix Shard Phoenix Shivan Phoenix Skyfire Phoenix Spellpyre Phoenix Sunstreak Phoenix Warcry Phoenix Worldheart Phoenix