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I haven't tuned this list up with Ivy Lane Denizen combo yet, but it's been a deck I keep coming back to and expect to keep together for a while

It means all cards in the deck should be discarded

There are cards which produce multiple threats at once or provide a threat on the back of a single card gain or single target removal

More pressing artifact and enchantment-based threats like Urzas Saga, Amulet of Vigor and Sigardas Aid can be removed in a timelier manner

This means that a Karn deck doesn't need to concern itself with including many creatures to attack or block with, as it can be used to turn anything from an Unwinding Clock to a Darksteel Forge into an offensive or defensive body on the board