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In the command zone or the 99, you should play this if you care about the graveyard and have the appropriate color identity

Tromell, Seymour's Butler and Surge Conductor are exceptionally easy and flexible ways to pump up your proliferates

The Brotherhood of Steel and the Institute keep this tech for themselves, so outside of joining one of these high-tech factions, you're going to be doing a lot of scavenging (or looting of folks from these factions)

One good option could be cards with variable costs, like Choco-Comet

In particular, there are a bunch of forum discussions dedicated to the Magic Online Cube

If we get the creature as well, great