Whispering Shade 
Creature — Shade
Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)
: This creature gets +1/+1 until end of turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL