mtg commander decks outlaws Sol Ring | of Thunder Junction | Commander Inside this bundle All four MTG Thunder Junction

Riku of Two Reflections gives you twice the fun as you confound and dazzle your foes into oblivion with a barrage of Rikus mirrored magic

Combo strategies that depend on synergy will see their win rate tank as they have to discard a card every turn, losing the chance to combo off

Its valuable too, currently selling for aound $280

Off the top of my head, in Standard and Modern, it prevents some or all of the use of the following cards: Every flashback card (in particular) Ancient Grudge Desperate Ravings Dread Return Dream Twist Faithless Looting Forbidden Alchemy Mystical Teachings Past in Flames Think Twice Unburial Rites Snapcaster Mage Narcomoeba Reanimate Exhume Every undying creature Every persist creature Gravecrawler Ichorid Ashen Ghoul Proclamation of Rebirth Polymorph Probably quite a few others 1) Drogskol Captain Hexproof is a very non-interactive creature mechanic, making it one of the more powerful mechanics to have been printed in recent years