Im looking forward to trying out Fathom Mage in my Cube to see how good it is outside of the hyper-aggressive zaniness that is Gatecrash
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However, you won't be able to summon it using its built-in summoning method, and must be Pendulum Summoned (since Xyz monsters don't have Levels, they'll specify in their Effect the Scales needed to summon them)
UB is a strange color identity for a sea creature deck, but Runo presents a fun mini-game to get it flipped, and Krothuss, Lord of the Deep is one of the best sea creature payoffs you could ask for
Legendary Creature - Human Warlock Counter Removal (CTRL to add secondary) Drain Syr Konrad, the Grim Whenever another creature dies, or a creature card is put into a graveyard from anywhere other than the battlefield, or a creature card leaves your graveyard, Syr Konrad deals 1 damage to each opponent