Guardian of the Great Conduit 
Creature — Elemental
Reach (This creature can block creatures with flying.) As long as you control a Nissa planeswalker, this creature gets +2/+0 and has vigilance. (Attacking doesn't cause it to tap.)
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL