Wintermoor Commander {W}{B}
Creature — Human Knight
Deathtouch
Wintermoor Commander's toughness is equal to the number of Knights you control.
Whenever this creature attacks, another target Knight you control gains indestructible until end of turn. (Damage and effects that say "destroy" don't destroy it.)
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Cards that do something similar expected a card that isn't here?
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Fey Steed 85%
$0.27#16710
"Whenever this creature attacks, another target attacking creature you control gains indestructible until end of turn."
Benalish Commander 82%
$0.24#15639
"this card's power and toughness are each equal to the number of Soldiers you control."