After playing with and against the card, I quickly realized how much of a powerhouse Sheoldred, the Apocalypse can be
No game changers No mass land denial No chaining extra turns No two-card infinite combos (game-enders, lockouts, or infinite) Few tutors 3
Trade Secrets Banned in Commander, Trade Secrets could just give two players their decks plus a Reliquary Tower in hand leaving everyone else behind if your chosen opponent engages the may clause at warp factor 10
Every Charizard-focused set has that one card that becomes almost mythical (think Base Set 1st Ed Charizard, Shining Charizard, etc.), and for Inferno X/Phantasmal Flames, this gold Mega Charizard X ex is that card
Its ease of use, low cost, and incredible effect ensure it a place in even the best decks