Mono U could likely support a rare mill deck (Ruin Crab, Maddening Cacophony, Field Research, Glacial Grasp, blockers like Skyclave Squid to fill the curve, etc), though most Mono-Blue inclined decks will likely just end up UB
At the same time, Wizards removed commons and uncommons from Alpha and Beta from the Reserved List, due to "overwhelming public support for this change," with a massive 91% of poll respondents saying they wanted cards removed from the list
The Great Henges mana cost is reduced by X generic mana equal to the greatest power among creatures you control
Leather Card Sleeve Template Tools Leather Chisel tool (I used Diamond chisel with 4 prongs of 4mm pitch), or, wing needle for sewing machine Hammer Ball-pen Scissors that are able to cut thick fabric, and/or, roller cutter and mat Nylon thread and a tapestry needle Clips Tragacanth Leather Burnishing gum and tools (optional) Edge Coat Paint and applicator (optional) Printer and cardstock (or paper) Instructions Gather all the materials and tools needed to make this leather card sleeve