Seton's Desire is a common Enchantment — Aura card from Odyssey (ODY), collector number 268. Current market price: $0.11 (foil $0.77), TCGplayer market prices via Scryfall.
Enchant creature Enchanted creature gets +2/+2. Threshold — As long as there are seven or more cards in your graveyard, all creatures able to block enchanted creature do so.