Gearsmith Guardian 
Artifact Creature — Construct
$0.05 #29172 0.07 8.1 years
This creature gets +2/+0 as long as you control a blue creature.
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Cards similar to Gearsmith Guardian expected a card that isn't here?
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Briarberry Cohort99%
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"This creature gets +1/+1 as long as you control another blue creature."
Minotaur Tactician96%
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"This creature gets +1/+1 as long as you control a blue creature."
Wingrattle Scarecrow82%
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"This creature has flying as long as you control a blue creature."
Glade Gnarr82%
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"Whenever a player casts a blue spell, this creature gets +2/+2 until end of turn."
Sapphire Medallion81%
$7.39↑#365↑0.30↑28.9 years↑
"Blue spells you cast cost 
less to cast."
less to cast."
Hydro-Man, Fluid Felon79%
$0.32↑#12002↑0.47↑1.0 years↓
"Whenever you cast a blue spell, if this card is a creature, he gets +1/+1 until end of turn."
Watchwing Scarecrow78%
$0.26↑#19111↑0.25↑18.3 years↑
"This creature has flying as long as you control a blue creature."
Gravelgill Duo78%
$0.09↑#296960.38↑18.3 years↑
"Whenever you cast a blue spell, this creature gets +1/+1 until end of turn."
Paragon of Gathering Mists78%
$0.22↑#21124↑0.0012.1 years↑
"Other blue creatures you control get +1/+1."
Dream Thief78%
$0.20↑#240970.42↑18.1 years↑
"When this creature enters, draw a card if you've cast another blue spell this turn."
Sunken City77%
$0.17↑#275690.0032.1 years↑
"Blue creatures get +1/+1."
Thistledown Liege76%
$0.58↑#13297↑0.31↑18.3 years↑
"Other blue creatures you control get +1/+1."
Ana Sanctuary76%
$0.18↑#18382↑0.0025.3 years↑
"At the beginning of your upkeep, if you control a blue or black permanent, target creature gets +1/+1 until end of turn. If you control a blue permanent and a black permanent, that creature gets +5/+5 until end of turn instead."
Thassa, God of the Sea75%
$3.50↑#1990↑0.37↑12.9 years↑
"As long as your devotion to blue is less than five, this card isn't a creature."
Thassa, Deep-Dwelling75%
$26.55↑#1276↑0.50↑6.6 years↓
"As long as your devotion to blue is less than five, this card isn't a creature."
Glen Elendra Liege75%
$0.91↑#4997↑0.0418.3 years↑
"Other blue creatures you control get +1/+1."
Ring of Evos Isle74%
$0.50↑#7146↑0.0414.1 years↑
"At the beginning of your upkeep, put a +1/+1 counter on equipped creature if it's blue."
Favor of the Overbeing74%
$0.50↑#8194↑0.22↑18.1 years↑
"As long as enchanted creature is blue, it gets +1/+1 and has flying."
Hate Weaver74%
$0.08↑#317150.0025.9 years↑
"
: Target blue or red creature gets +1/+0 until end of turn."
: Target blue or red creature gets +1/+0 until end of turn."
Murkfiend Liege73%
$2.14↑#2640↑0.36↑18.1 years↑
"Other blue creatures you control get +1/+1."