It's a static ability that lets you cast the harmonize card from your graveyard by paying an alternate cost
(They put the top two cards of their library into their graveyard.) Flavor Text "I'm sorry, but this information is classified." Number 53 Language English Legal Formats Commander, Legacy, Modern, Vintage Not Legal Formats Alchemy, Brawl, Competitive Brawl, Historic, Pauper, Pioneer, Standard, Timeless Rulings (6/18/2021) If Mystic Redaction's last ability triggers during the cleanup step because you are discarding due to maximum hand size, players will be able to respond to that ability
Especially if we wind up with more colorless cards in the future and not just what comes from Oath of the Gatewatch
There's a powerful risk here, but often EX cards are certainly worth it
Ruler of the Black Flame (SV3) features the most valuable modern Charizard Charizard ex SAR at 47,800, worth over 3 the box price