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You'll also want to include a couple of alternate attackers, so that you aren't entirely reliant on your commander

Its making me contemplate being active for a season and playing in person constructed, just to get all of the goodies

The best and most obvious Sliver upgrades are the flashy 5C ones: Sliver Overlord, Sliver Legion, Sliver Queen, and The First Sliver

Planechase is an incredibly popular format, especially at in-person events

4 Mana Ramp If theres one thing that green does the best, its producing mana

If there are relevant creatures that need to be dealt with, it makes sense to swap your Shriekhorns for Lightning Axes