So Tiny is a common Enchantment — Aura card from Throne of Eldraine (ELD), collector number 64. Current market price: $0.11 (foil $0.26), TCGplayer market prices via Scryfall.
Flash Enchant creature Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.