Shadow Guildmage is a special Creature — Human Wizard card from Time Spiral Timeshifted (TSB), collector number 46. Current market price: $0.26 (foil $1.22), TCGplayer market prices via Scryfall.
{U}, {T}: Put target creature you control on top of its owner's library. {R}, {T}: This creature deals 1 damage to any target and 1 damage to you.