Nighthawk, Dark Defender 
Legendary Creature — Human Hero
$0.28 #29042 0.00 0.2 years
Flying
Whenever Nighthawk or another Hero you control enters, target creature gets +1/+1 until end of turn.
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Cards similar to Nighthawk, Dark Defender expected a card that isn't here?
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Black Panther, Vanguard86%
$0.14↓#21603↑0.000.2 years
"Whenever another nontoken Hero you control enters, choose one —"
Team Transmitter84%
$0.65↑#19168↑0.000.2 years
"Whenever a Hero you control enters, you gain 1 life."
Doctor Spectrum84%
$0.27↓#268700.000.2 years
"Flying"
Umara Raptor84%
$0.14↓#17940↑0.0016.9 years↑
"Flying"
Boltwing Marauder83%
$0.18↓#19078↑0.0911.4 years↑
"Whenever another creature you control enters, target creature gets +2/+0 until end of turn."
Scarlet Witch, Chaotic Avenger82%
$0.35↑#12365↑0.000.2 years
"Flying"
Drogskol Cavalry82%
$0.38↑#13902↑0.29↑10.4 years↑
"Flying"
Fallaji Vanguard82%
$0.13↓#19670↑0.003.8 years↑
"Whenever this creature or another creature you control enters, target creature gets +2/+0 until end of turn."
Captain America, Team Leader82%
$0.95↑#12435↑0.000.2 years
"Whenever another Hero you control enters, it gains vigilance and haste until end of turn. Put a +1/+1 counter on that Hero and a +1/+1 counter on this card."
Hawkeye, Trick Shot81%
$3.37↑#15619↑0.000.2 years
"Whenever this card or another Hero you control enters, it deals damage equal to the number of Heroes you control to any target."
Wakandan Royal Guard79%
$0.10↓#235880.000.2 years
"When this creature enters, put a +1/+1 counter on target creature. If that creature is another Hero, put two +1/+1 counters on it instead."
Welcoming Vampire78%
$1.94↑#424↑0.22↑4.8 years↑
"Flying"
Scourge of Valkas78%
$3.43↑#1527↑0.45↑13.1 years↑
"Flying"
The Wasp, Winsome Avenger77%
$0.24↓#15172↑0.000.2 years
"When this card enters, target Hero gains hexproof until end of turn."
East Wind Avatar76%
$0.10↓#248880.000.5 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Griffin Protector76%
$0.08↓#21281↑0.25↑14.1 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Invisible Woman, Sue Storm76%
$0.34↑#13140↑0.000.2 years
"Whenever you put one or more +1/+1 counters on one or more other Heroes you control, you may create a 0/4 colorless Wall creature token with defender."
Stenchskipper76%
$0.31↑#292980.18↑18.6 years↑
"Flying"
Avengers Assemble!75%
$1.68↑#12735↑0.000.2 years
"At the beginning of each end step, if you attacked with a Hero this turn or a Hero entered the battlefield under your control this turn, draw a card."
Mausoleum Wanderer74%
$0.28#6770↑0.32↑10.1 years↑
"Flying"