SLD: The First Sliver Strategy Whenever a Mountain is tapped

Whenever a Mountain is tapped for mana

Unattach an Equipment from Captain America: He deals damage equal to that Equipment's mana value divided as you choose among one

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Glacial Fortress enters tapped unless you control a Plains or an Island

SLD: The First Sliver Strategy Whenever a Mountain is tappedCascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Sliver spells you cast have cascade.