
] should honestly be in every deck that runs blue. I use ] effects to stack the top of the deck and cascade as much as possible off a single cast. You can build FS to go really fast and win out of nowhere but I purposely hamstringed myself because I like playing this deck at more beginner friendly tables. Meanwhile the first Sliver says "do you have 5 mana? Well let's fucking go!" I run ] as a companion because it signals I'm probably not going combo (no ] or ]) and the lands are all there to slow my deck down. The 5 to cast, 3 to tutor, then whatever mana to cast that Sliver adds up very fast to the point you'll be spending 10+ mana to cast a single spell each turn. Overlord will be removed over and over again as players know you're simply going for combo and unless you want to include all the expensive fast mana rocks and other ramp you'll never be able to keep up outside of very low power tables. First Sliver explodes much faster than overlord and has a much higher resiliency to removal and board wipes: your commander is always a 2 for 1 (minus some effects like ] etc). This is more or less my current Slivers build that I'm playing. or big draw to get the mana you need (think of Overlord as an 8-11 mana tutor/wincon). You either need value ramp like ], ], etc. 33% to draw a card? (You'll need at least 6 more decent draw. too slow for edh and fixing for BB sucks.

Idk how cutthroat your meta is, but Overlord is right on the edge. Whenever I played it, I was archenemy for sure and with one line of play: -> / -> infinite combo (of which there are several just within Slivers). I've been playing for a while and would highly recommend it! It plays more like Slivers/midrange than combo/control.
