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Boromir, Warden of the Tower shuts down abilities that cast spells for free, and you can sacrifice it to protect your board at a key moment

There is another bit of extra support that would assist the Train strategy as well, using a small Infinitrack package, with the main goal of resolving Infinitrack Brutal Dozer to summon an Infinitrack Trencher or Infinitrack Tunneller from the Deck to make an Infinitrack River Stormer to search your key pieces of your Rank 10 plays, with Infinitrack Harvester being able to search for your Brutal Dozer to get you to your River Stormer, and you gain the potential to summon Infinitrack Goliath that could later put itself under your Gustav Max and Juggernaut Liebe to give your monster proectiton from destruction effects

Slivers can seem unbeatable, especially in casual Commander

yeah, limited it is