Delvefall
Edgar, Master Machinist

Edgar, Master Machinist {2}{R}{W}

Legendary Creature — Human Artificer Noble

Once during each of your turns, you may cast an artifact spell from your graveyard. If you cast a spell this way, that artifact enters tapped.
Tools — Whenever Edgar attacks, it gets +X/+0 until end of turn, where X is the greatest mana value among artifacts you control.

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Cards that do something similar expected a card that isn't here?

Skanos Dragonheart
Skanos Dragonheart 90%
$0.22#11232
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other Dragons you control and Dragon cards in your graveyard."
Tuya Bearclaw
Tuya Bearclaw 84%
$0.19#10264
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Killmonger, Ruthless Usurper
Killmonger, Ruthless Usurper 84%
$0.31#18134
"Whenever this card attacks, he gets +1/+0 until end of turn for each artifact defending player controls."
Jor Kadeen, First Goldwarden
Jor Kadeen, First Goldwarden 82%
$0.29#9255
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the number of equipped creatures you control. Then if this card's power is 4 or greater, draw a card."
Imaryll, Elfhame Elite
Imaryll, Elfhame Elite 80%
#14218
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the number of other Elves you control."