Nimble Mongoose 
Creature — Mongoose
Shroud (This creature can't be the target of spells or abilities.) Threshold — This creature gets +2/+2 as long as seven or more cards are in your graveyard.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL