Octavia, Living Thesis is a rare Legendary Creature — Elemental Octopus card from Commander 2021 (C21), collector number 29. Current market price: $0.99, TCGplayer market prices via Scryfall.
This spell costs {8} less to cast if you have eight or more instant and/or sorcery cards in your graveyard. Ward {8} Magecraft — Whenever you cast or copy an instant or sorcery spell, target creature has base power and toughness 8/8 until end of turn.