Flockchaser Phantom {4}{W}{U}
Creature — Spirit
Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)
Flying, vigilance
Whenever this creature attacks, the next spell you cast this turn has convoke.
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Cards that do something similar expected a card that isn't here?
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Xantid Swarm 87%
$3.88#13727
"Whenever this creature attacks, defending player can't cast spells this turn."
Hardened Berserker 87%
$0.03#23580
"Whenever this creature attacks, the next spell you cast this turn costs {1} less to cast."
Ogre Marauder 86%
$0.25#24804
"Whenever this creature attacks, it gains "this creature can't be blocked" until end of turn unless defending player sacrifices a creature of their choice."
Yuan Shao's Infantry 86%
$5.31#31156
"Whenever this creature attacks alone, this creature can't be blocked this combat."
Smirking Spelljacker 86%
$2.79#6873
"Whenever this creature attacks, if a card is exiled with it, you may cast the exiled card without paying its mana cost."
Goblin Maskmaker 85%
$0.11#21018
"Whenever this creature attacks, face-down spells you cast this turn cost {1} less to cast."
Rubblebelt Braggart 83%
$0.05#26335
"Whenever this creature attacks, if it's not suspected, you may suspect it."
Abyssal Nightstalker 83%
$0.50#27330
"Whenever this creature attacks and isn't blocked, defending player discards a card."
Gutter Skulker // Gutter Shortcut 82%
$0.08#21571
"This creature can't be blocked as long as it's attacking alone."
Mirror-Style Master 81%
$0.27#12093
"Whenever this creature attacks, for each attacking modified creature you control, create a tapped and attacking token that's a copy of that creature. Exile those tokens at end of combat."
Tilonalli's Skinshifter 81%
$0.26#22819
"Whenever this creature attacks, it becomes a copy of another target nonlegendary attacking creature until end of turn."
Stromgald Spy 81%
$0.15#29721
"Whenever this creature attacks and isn't blocked, you may have defending player play with their hand revealed for as long as this creature remains on the battlefield. If you do, this creature assigns no combat damage this turn."
Creepy Puppeteer 80%
$0.19#25029
"Whenever this creature attacks, if you attacked with exactly one other creature this combat, you may have that creature's base power and toughness become 4/3 until end of turn."
Sunfrill Imitator 80%
$0.80#3713
"Whenever this creature attacks, you may have it become a copy of another target Dinosaur you control, except its name is this card and it has this ability."
Pugnacious Hammerskull 80%
$0.43#5199
"Whenever this creature attacks while you don't control another Dinosaur, put a stun counter on it."