Magnetic Web 
Artifact
$0.66 #20454 0.64 28.9 years
If a creature with a magnet counter on it attacks, all creatures with magnet counters on them attack if able.
Whenever a creature with a magnet counter on it attacks, all creatures with magnet counters on them block that creature this turn if able.
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Cards similar to Magnetic Web expected a card that isn't here?
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Grappling Hook84%
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"Whenever equipped creature attacks, you may have target creature block it this turn if able."
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"Whenever this creature attacks, target creature defending player controls blocks it this combat if able."
Trumpeting Armodon81%
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"
: Target creature blocks this creature this turn if able."
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$0.05↓#31123↓0.24↓25.9 years↓
"
: Target creature blocks this creature this turn if able."
Burning-Tree Bloodscale76%
$0.05↓#29997↓0.00↓21.0 years↓
"
: Target creature blocks this creature this turn if able."
War's Toll76%
$9.87↑#5350↑1.25↑20.3 years↓
"If a creature an opponent controls attacks, all creatures that opponent controls attack if able."
Grand Melee76%
$1.41↑#14817↑0.6223.9 years↓
"All creatures attack each combat if able."
+1 more matching line
Angler Turtle76%
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"Creatures your opponents control attack each combat if able."
Boros Battleshaper74%
$0.27↓#214200.27↓13.3 years↓
"At the beginning of each combat, up to one target creature attacks or blocks this combat if able and up to one target creature can't attack or block this combat."
Fighter Class74%
$8.99↑#2273↑0.26↓5.1 years↓
"Whenever a creature you control attacks, up to one target creature blocks it this combat if able."
Crashing Boars74%
$0.12↓#29794↓0.24↓28.2 years
"Whenever this creature attacks, defending player chooses an untapped creature they control. That creature blocks this creature this turn if able."
Tolsimir, Midnight's Light74%
$0.29↓#10313↑0.35↓2.6 years↓
"Whenever a Wolf you control attacks, if this card attacked this combat, target creature an opponent controls blocks that Wolf this combat if able."
Courtly Provocateur74%
$0.19↓#213950.5714.1 years↓
"
: Target creature blocks this turn if able."
+1 more matching line
Impetuous Devils74%
$0.26↓#16026↑0.00↓10.1 years↓
"When this creature attacks, up to one target creature defending player controls blocks it this combat if able."
Hunt Down74%
$0.19↓#27072↓0.26↓18.9 years↓
"Target creature blocks target creature this turn if able."
Thantis, the Warweaver73%
$0.55↓#10491↑0.20↓8.1 years↓
"All creatures attack each combat if able."
+1 more matching line
Tangle Angler73%
$0.16↓#205170.27↓15.9 years↓
"
: Target creature blocks this creature this turn if able."
Shipwreck Singer73%
$0.07↓#26392↓0.09↓12.9 years↓
"
: Target creature an opponent controls attacks this turn if able."