Lurking Grinder

At the beginning of your end step, if Lurking
Grinder has not attacked since it came onto
the battlefield, Exile the top 2 cards of target
library.
When Luring Grinder attacks of blocks, put
X +1/+1 counters on it, where X is the number
of cards that have been Exile by all Lurking
Grinders during the game.
"Easy to ignore, right up until they are suddenly
not."