Colossification is a rare Enchantment — Aura card from Ikoria: Lair of Behemoths Promos (PIKO), collector number 148p. Current market price: $2.96 (foil $7.10), TCGplayer market prices via Scryfall.
Enchant creature When this Aura enters, tap enchanted creature. Enchanted creature gets +20/+20.