It's a classic Commander card in that if a player really wants to roll the dice and not let you draw a card, they could get extremely lucky, and you mill lands off the top of your deck, but if you just so happen to send some high-value cards to the graveyard, your opponent is going to be hit for massive life damage out of nowhere
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If you don't actively monitor your cards' value, you risk selling at the wrong time or missing a buying opportunity
More importantly, its activated ability is key for defender-themed decks, as it lets your creatures attack as though they didnt have the defender ability
I picked Sword of Feast and Famine and Sword of Light and Shadow both because I think theyre the best Swords for Commander and also because they combine with Cover of Darkness to make a creature unblockable except to artifact creatures (though Scuttlemutt can solve that little problem)
If youd rather just end the game, Burn at the Stake is a five-mana sorcery that lets you tap creatures to deal three times that damage to a creature or player