Elbrus, the Binding Blade // Withengar Unbound
Legendary Artifact — Equipment // Legendary Creature — Demon
Equipped creature gets +1/+0.
When equipped creature deals combat damage to a player, unattach Elbrus, then transform it.
Equip {1}
Flying, intimidate, trample (A creature with intimidate can't be blocked except by artifact creatures and/or creatures that share a color with it.)
Whenever a player loses the game, put thirteen +1/+1 counters on Withengar Unbound.
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Cards that do something similar expected a card that isn't here?
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Specter's Shroud 89%
$0.29#20700
"Whenever equipped creature deals combat damage to a player, that player discards a card."
+2 more matching lines
Skeleton Key 85%
$0.25#8786
"Whenever equipped creature deals combat damage to a player, you may draw a card. If you do, discard a card."
+1 more matching line
Dowsing Dagger // Lost Vale 84%
$6.82#2347
"Whenever equipped creature deals combat damage to a player, you may transform this Equipment."
+2 more matching lines
Scytheclaw 83%
$0.26#7251
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
+1 more matching line
Quietus Spike 83%
$1.75#2690
"Whenever equipped creature deals combat damage to a player, that player loses half their life, rounded up."
Blinding Powder 83%
$0.44#17699
"Equipped creature has "Unattach this card: Prevent all combat damage that would be dealt to this creature this turn.""
+1 more matching line
Worldslayer 83%
$3.28#8510
"Whenever equipped creature deals combat damage to a player, destroy all permanents other than this Equipment."
+1 more matching line
Whispersteel Dagger 81%
$0.31#15642
"Whenever equipped creature deals combat damage to a player, you may cast a creature spell from that player's graveyard this turn, and you may spend mana as though it were mana of any color to cast that spell."
+1 more matching line