Canoptek Spyder 
Artifact Creature — Spider
$11.54 #3358 0.32 4.0 years
Flying
Fabricator Claw Array — Whenever another nontoken artifact creature or Vehicle you control enters, draw a card.
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"Whenever another nontoken creature you control enters, you may draw a card."
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Huatli, Radiant Champion80%
$4.01↓#9602↓0.13↓8.8 years↑
"−8: You get an emblem with "Whenever a creature you control enters, you may draw a card.""
Garruk's Packleader79%
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"Whenever another creature you control with power 3 or greater enters, you may draw a card."
Elemental Bond79%
$1.45↓#550↑0.2711.3 years↑
"Whenever a creature you control with power 3 or greater enters, draw a card."
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"Flying"
Welcoming Vampire76%
$2.26↓#428↑0.17↓4.9 years
"Whenever one or more other creatures you control with power 2 or less enter, draw a card. This ability triggers only once each turn."
Beck // Call76%
$0.30↓#17469↓0.05↓13.5 years↑
"Whenever a creature enters this turn, you may draw a card."
Tribute to the World Tree76%
$14.27↑#615↑0.413.5 years
"Whenever a creature you control enters, draw a card if its power is 3 or greater. Otherwise, put two +1/+1 counters on it."
Kindred Discovery75%
$5.18↓#339↑0.44↑9.2 years↑
"Whenever a creature you control of the chosen type enters or attacks, draw a card."
The Blue Spirit74%
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"Whenever a nontoken creature you control enters during combat, draw a card."
Arcbound Stinger74%
$0.21↓#8338↓0.00↓22.7 years↑
"Flying"
Consecrated Sphinx74%
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Woodland Liege74%
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The Great Henge74%
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Archon of Coronation74%
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Nakia, Wakandan Operative73%
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"Whenever your commander enters, you become the monarch."