Portal Manipulator 
Creature — Human Wizard
$1.38 #14407 0.80 2.5 years
Flash
When this creature enters during the declare attackers step, choose target player and any number of target attacking creatures their opponents control. Those creatures are now attacking that player.
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Cards similar to Portal Manipulator expected a card that isn't here?
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Portal Mage84%
$0.25↓#10382↑0.12↓9.0 years↑
"When this creature enters during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking."
+1 more matching line
Windshaper Planetar84%
$0.26↓#11347↑0.734.2 years↑
"When this creature enters during the declare attackers step, for each attacking creature, you may reselect which player or permanent that creature is attacking."
+1 more matching line
Misleading Signpost82%
$13.19↑#3245↑0.35↓3.0 years
"When this artifact enters during the declare attackers step, you may reselect which player or permanent target attacking creature is attacking."
Master Warcraft71%
$0.61↓#5406↑0.43↓20.9 years↑
"You choose which creatures attack this turn."
Ravener70%
$1.14↓#10109↑0.35↓3.9 years↑
"When this creature enters, target creature attacks target opponent this turn if able."
+1 more matching line
Armaggon, Future Shark70%
$0.48↓#10471↑0.00↓0.5 years↓
"Flash"