Octopus Form is a common Instant — Lesson card from Avatar: The Last Airbender (TLA), collector number 66. Current market price: $0.17 (foil $0.33), TCGplayer market prices via Scryfall.
Target creature you control gets +1/+1 and gains hexproof until end of turn. Untap it. (It can't be the target of spells or abilities your opponents control.)