Gemini Engine 
Artifact Creature — Construct
$0.30 #25654 0.50 22.6 years
Whenever this creature attacks, create a colorless Construct artifact creature token named Twin that's attacking. Its power is equal to this creature's power and its toughness is equal to this creature's toughness. Sacrifice the token at end of combat.
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Cards similar to Gemini Engine expected a card that isn't here?
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Galion, Elvenking's Butler80%
$0.15↓#229260.00↓0.1 years↓
"Whenever this card attacks, choose up to one other target creature you control. Its base power and toughness become equal to this card's power and toughness until end of turn."
Krenko, Tin Street Kingpin80%
$2.63↑#894↑0.427.3 years↓
"Whenever this card attacks, put a +1/+1 counter on it, then create a number of 1/1 red Goblin creature tokens equal to this card's power."
Tanazir Quandrix78%
$0.28↓#8451↑0.445.4 years↓
"Whenever this card attacks, you may have the base power and toughness of other creatures you control become equal to this card's power and toughness until end of turn."
Jacked Rabbit77%
$4.03↑#2130↑0.24↓2.1 years↓
"Whenever this creature attacks, create a number of 1/1 white Rabbit creature tokens equal to this creature's power."
Kavaron Harrier77%
$0.14↓#16887↑0.19↓1.1 years↓
"Whenever this creature attacks, you may pay 
. If you do, create a 2/2 colorless Robot artifact creature token that's tapped and attacking. Sacrifice that token at end of combat."
. If you do, create a 2/2 colorless Robot artifact creature token that's tapped and attacking. Sacrifice that token at end of combat."
Syr Faren, the Hengehammer74%
$0.22↓#16218↑0.31↓6.9 years↓
"Whenever this card attacks, another target attacking creature gets +X/+X until end of turn, where X is this card's power."
Iron-Craw Crusher74%
$0.20↓#18343↑0.00↓3.8 years↓
"Whenever this creature attacks, target attacking creature gets +X/+0 until end of turn, where X is this creature's power."
Fire Navy Trebuchet73%
$0.24↓#11166↑0.00↓0.8 years↓
"Whenever you attack, create a 2/1 colorless Construct artifact creature token with flying named Ballistic Boulder that's tapped and attacking. Sacrifice that token at the beginning of the next end step."
Firebird, Blazing Ranger72%
$0.26↓#16220↑0.00↓0.2 years↓
"Whenever this card attacks, other attacking creatures get +X/+0 until end of turn, where X is this card's power."
Threefold Thunderhulk72%
$0.36↑#1846↑0.16↓2.8 years↓
"Whenever this creature enters or attacks, create a number of 1/1 colorless Gnome artifact creature tokens equal to its power."
Rubblebelt Rioters72%
$0.19↓#18106↑0.12↓7.3 years↓
"Whenever this creature attacks, it gets +X/+0 until end of turn, where X is the greatest power among creatures you control."
Wild Beastmaster72%
$0.22↓#8469↑0.10↓13.9 years↓
"Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power."
Tuya Bearclaw72%
$0.26↓#10523↑0.24↓5.8 years↓
"Whenever this card attacks, it gets +X/+X until end of turn, where X is the greatest power among other creatures you control."
Gruul Beastmaster71%
$0.09↓#245430.25↓7.6 years↓
"Whenever this creature attacks, another target creature you control gets +X/+0 until end of turn, where X is this creature's power."
Broken Visage70%
$0.36↑#299350.25↓30.9 years↑
"Destroy target nonartifact attacking creature. It can't be regenerated. Create a black Spirit creature token. Its power is equal to that creature's power and its toughness is equal to that creature's toughness. Sacrifice the token at the beginning of the next end step."
Unruly Krasis70%
$0.41↑#219640.06↓2.5 years↓
"Whenever this creature attacks, you may have the base power and toughness of another target creature you control become X/X until end of turn, where X is this creature's power."