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If you want to be super-aggressive, Sliver Legion is your ticket, but if you want to be more flexible then Sliver Overlord is the obvious choice
And theres collectability, especially when it comes to The Reserved List
In general, drawing cards tends to be a tempo-negative play: You spend resources to get cards that you may use later, rather than affecting the board right now
If something seems to be going wrong, like its been 3-4 days and the state hasnt changed, be proactive and look into it
Skrelv, Defector Mite Skrelv, Defector Mite is an incredibly cheap commander, allowing you to easily drop it turn 1 and start dealing out poison counters on subsequent early turns