Nighthawk, Dark Defender 
Legendary Creature — Human Hero
$0.27 #28809 0.30 0.3 years
Flying
Whenever Nighthawk or another Hero you control enters, target creature gets +1/+1 until end of turn.
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Scarlet Witch, Chaotic Avenger87%
$0.38↑#11391↑0.54↑0.3 years
"Flying"
Black Panther, Vanguard86%
$0.11↓#21136↑0.13↓0.3 years
"Whenever another nontoken Hero you control enters, choose one —"
Hawkeye, Trick Shot84%
$3.00↑#14666↑0.380.3 years
"Whenever this card or another Hero you control enters, it deals damage equal to the number of Heroes you control to any target."
Boltwing Marauder83%
$0.18↓#19397↑0.00↓11.6 years↑
"Whenever another creature you control enters, target creature gets +2/+0 until end of turn."
Fallaji Vanguard82%
$0.15↓#19973↑0.19↓3.9 years↑
"Whenever this creature or another creature you control enters, target creature gets +2/+0 until end of turn."
Captain America, Team Leader82%
$0.66↑#11476↑0.47↑0.3 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."
Team Transmitter80%
$1.10↑#18258↑0.15↓0.3 years
"Whenever a Hero you control enters, you gain 1 life."
Wakandan Royal Guard78%
$0.13↓#22774↑0.220.3 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."
The Wasp, Winsome Avenger77%
$0.19↓#14324↑0.310.3 years
"When this card enters, target Hero gains hexproof until end of turn."
East Wind Avatar76%
$0.09↓#246140.07↓0.6 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Griffin Protector76%
$0.09↓#21601↑0.00↓14.3 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Invisible Woman, Sue Storm76%
$0.25↓#12026↑0.240.3 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."
Avengers Assemble!75%
$1.84↑#11792↑0.41↑0.3 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."
Mutant Town Musicians74%
$0.07↓#252910.210.6 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Llanowar Stalker74%
$0.15↓#22852↑0.06↓4.1 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Beast-Kin Ranger74%
$0.19↓#15328↑0.05↓1.9 years↑
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Crossroads Watcher74%
$0.13↓#19487↑0.15↓0.7 years
"Whenever another creature you control enters, this creature gets +1/+0 until end of turn."
Attended Socialite74%
$0.13↓#239770.00↓4.5 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Loporrit Scout74%
$0.12↓#18974↑0.00↓1.4 years↑
"Whenever another creature you control enters, this creature gets +1/+1 until end of turn."
Thing Swing74%
$0.21↓#231910.13↓0.3 years
"This spell costs 
less to cast if it targets a Hero you control."
less to cast if it targets a Hero you control."