Vanguard of the Restless 

Creature — Spirit Knight
$0.23 #10989 0.20 0.5 years
Flying
Spirits you control get +1/+1 for each time you've cast your commander from the command zone this game.
Whenever a Spirit you control enters, you may pay 
. If you do, return this card from your graveyard to the battlefield.
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Cards similar to Vanguard of the Restless expected a card that isn't here?
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Commander's Insignia89%
$0.12↓#8426↑0.187.2 years↑
"Creatures you control get +1/+1 for each time you've cast your commander from the command zone this game."
Supreme Phantom79%
$0.33↑#97950.06↓8.3 years↑
"Other Spirits you control get +1/+1."
+1 more matching line
Captain Vargus Wrath74%
$0.27↑#131370.115.9 years↑
"Whenever this card attacks, Pirates you control get +1/+1 until end of turn for each time you've cast a commander from the command zone this game."
Obscura Ascendancy70%
$0.09↓#24921↓0.204.5 years↑
"As long as there are five or more soul counters on this enchantment, Spirits you control get +3/+3."