Unassuming Gelatinous Serpent is a common Stickers card from Unfinity Sticker Sheets (SUNF), collector number 36. Current market price: $0.35, TCGplayer market prices via Scryfall.
{TK}{TK} — When this permanent dies, return target noncreature, nonland card from your graveyard to your hand. {TK}{TK}{TK}{TK} — Whenever this creature deals combat damage to a player, that player mills twice that many cards. {TK}{TK} — 2/3 {TK}{TK}{TK} — 7/2