can swampwalk creature block another swampwalk creature?
can swampwalk creature block another swampwalk creature?
Not if you control a Swamp. Swampwalk means that if you control a Swamp, then the creature can't be blocked, period.
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If the defending player controls a swamp, a swampwalker is unblockable. That aside, there's nothing stopping one swampwalker from blocking another if no swamps are involved.