Longtusk Cub is a uncommon Creature — Cat card from Kaladesh (KLD), collector number 161. Current market price: $0.21 (foil $0.94), TCGplayer market prices via Scryfall.
Whenever this creature deals combat damage to a player, you get {E}{E} (two energy counters). Pay {E}{E}: Put a +1/+1 counter on this creature.