Well, youre in luck that sort of Rakdos control deck is currently a dominant Standard archetype
Mill is a very popular archetype in EDH, and The Water CrystalThe Water Crystal fits perfectly there...And that's probably its only home
I did lose a close match to a black deck because, well, sometimes they just Thoughtseize and Pack Rat and theres nothing you can do about it
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Sometimes this deck can feel like a numbers game, cause much of the deck is designed around getting to nine mana as quickly as possible, with access to all five colors, so you can drop The Ur-Dragon and then start attacking to trigger its attack effect
It doesnt look flashy, but the first time you investigate each turn, it gives you a bonus Clue for free