Guardian of the Great Conduit is a uncommon Creature — Elemental card from Kaladesh (KLD), collector number 271. Current market price: $0.03, TCGplayer market prices via Scryfall.
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.)