Well Rested is a uncommon Enchantment — Aura card from Fallout (PIP), collector number 88. Current market price: $2.68 (foil $7.27), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature has "Whenever this creature becomes untapped, put two +1/+1 counters on it, then you gain 2 life and draw a card. This ability triggers only once each turn."