Cabal Initiate 

Creature — Human Warlock
Discard a card: This creature gains lifelink until end of turn.
Threshold — This creature gets +1/+2 as long as there are seven or more cards in your graveyard.
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Cards that do something similar expected a card that isn't here?
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Hardened Academic 100%
$0.39#13138
"Discard a card: This creature gains lifelink until end of turn."
Nantuko Calmer 99%
$0.25#27979
"This creature gets +1/+1 as long as there are seven or more cards in your graveyard."
Krosan Beast 97%
$5.05#18711
"This creature gets +7/+7 as long as there are seven or more cards in your graveyard."
Metamorphic Wurm 97%
$0.19#26409
"This creature gets +4/+4 as long as there are seven or more cards in your graveyard."
Billowing Shriekmass 92%
$0.17#17670
"This creature gets +2/+1 as long as there are seven or more cards in your graveyard."
Werebear 91%
$0.22#8089
"This creature gets +3/+3 as long as there are seven or more cards in your graveyard."
Anurid Barkripper 91%
$0.19#26342
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Seton's Scout 91%
$0.23#29076
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Springing Tiger 91%
$0.15#30552
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Nimble Mongoose 91%
$0.06#26419
"This creature gets +2/+2 as long as there are seven or more cards in your graveyard."
Mind Drill Assailant 80%
$0.14#14377
"As long as there are seven or more cards in your graveyard, this creature gets +3/+0."