Sample Collector 
Creature — Troll Detective
$0.04 #29553 0.20 2.6 years
Whenever this creature attacks, you may collect evidence 3. When you do, put a +1/+1 counter on target creature you control. (To collect evidence 3, exile cards with total mana value 3 or greater from your graveyard.)
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Cards similar to Sample Collector expected a card that isn't here?
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Ant-Man, Colony Commander86%
$0.20↑#16701↑0.00↓0.2 years↓
"Whenever this card attacks, you may pay 
. When you do, put a +1/+1 counter on target creature."
. When you do, put a +1/+1 counter on target creature."
Merry Bards80%
$0.13↑#262150.273.0 years
"When this creature enters, you may pay . When you do, create a Young Hero Role token attached to target creature you control."
. When you do, create a Young Hero Role token attached to target creature you control."
Augusta, Order Returned78%
$0.20↑#12036↑0.00↓0.4 years↓
"Whenever this card attacks, each player exiles a card from their graveyard. When one or more nonland cards are exiled this way, put that many +1/+1 counters on target attacking creature."
Grim Reaper, Lethal Legionnaire76%
$0.14↑#20375↑0.00↓0.2 years↓
"Whenever this card attacks, you may pay 
. When you do, return target creature card from your graveyard to the battlefield tapped and attacking with a finality counter on it."
. When you do, return target creature card from your graveyard to the battlefield tapped and attacking with a finality counter on it."
Labyrinth Adversary74%
$0.11↑#20179↑0.84↑2.2 years
"Whenever you attack, you may pay 
. When you do, target creature can't block this turn."
. When you do, target creature can't block this turn."
Thousand Moons Crackshot73%
$0.08↑#267330.56↑2.8 years
"Whenever this creature attacks, you may pay 
. When you do, tap target creature."
. When you do, tap target creature."
Vitu-Ghazi Inspector72%
$0.14↑#261670.182.6 years
"As an additional cost to cast this spell, you may collect evidence 6."
Terror of Towashi72%
$0.34↑#12114↑0.33↑3.4 years
"Whenever this creature attacks, you may pay . When you do, return target creature card from your graveyard to the battlefield. It's a Phyrexian in addition to its other types."
. When you do, return target creature card from your graveyard to the battlefield. It's a Phyrexian in addition to its other types."
Icewrought Sentry72%
$0.25↑#12242↑0.183.0 years
"Whenever this creature attacks, you may pay 
. When you do, tap target creature an opponent controls."
. When you do, tap target creature an opponent controls."
Leatherhead, Iron Gator72%
$0.30↑#9221↑0.00↓0.5 years↓
"Whenever this card attacks, put two +1/+1 counters on each creature you control."
Skyrider Patrol71%
$0.11↑#23353↑0.00↓8.1 years↑
"At the beginning of combat on your turn, you may pay . When you do, put a +1/+1 counter on another target creature you control, and that creature gains flying until end of turn."
. When you do, put a +1/+1 counter on another target creature you control, and that creature gains flying until end of turn."
Anointer of Valor70%
$0.12↑#21364↑0.00↓5.8 years↑
"Whenever a creature attacks, you may pay . When you do, put a +1/+1 counter on that creature."
. When you do, put a +1/+1 counter on that creature."
Sutina, Speaker of the Tajuru70%
$0.32↑#9204↑0.271.8 years
"Whenever this card attacks, you may return a land you control to its owner's hand. When you do, put a +1/+1 counter on target creature."
Ty Lee, Artful Acrobat70%
$0.23↑#11607↑0.00↓0.8 years↓
"Whenever this card attacks, you may pay . When you do, target creature can't block this turn."
. When you do, target creature can't block this turn."
Forgehammer Centurion70%
$0.06↑#22201↑0.40↑3.6 years
"Whenever this creature attacks, you may remove two oil counters from it. When you do, target creature can't block this turn."
Spined Tyrranax70%
$0.30↑#21689↑0.121.8 years
"At the beginning of combat on your turn, you may pay . When you do, put a +1/+1 counter on target creature. That creature gains trample until end of turn."
. When you do, put a +1/+1 counter on target creature. That creature gains trample until end of turn."
Matt Murdock, Justice Seeker70%
$0.67↑#15288↑0.00↓0.2 years↓
"At the beginning of combat on your turn, you may pay . When you do, put a +1/+1 counter on target creature you control."
. When you do, put a +1/+1 counter on target creature you control."
The Thing70%
$0.34↑#16114↑0.00↓0.2 years↓
"Whenever this card attacks, you may pay . When you do, double the number of each kind of counter on any number of target permanents you control."
. When you do, double the number of each kind of counter on any number of target permanents you control."