Your search for "Entomb 310" revealed the following:
Sett - The Boss (Overnumbered) - 310/298 - Showcase from Riftbound: Origins, available at 401 Games Canada. Rarity: Showcase Finish: Foil Artist: Gem Lim Card Text:When a buffed unit you control would die, you may pay Rune and exhaust me...
Entomb - Elemental Frame Showcase (TLE) from Avatar: The Last Airbender Eternal, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Shane Beresford Card Text:Search your library for a card and put that card into your graveyard, then shuffle....