Surge Engine is a mythic Artifact Creature — Construct card from The Brothers' War Promos (PBRO), collector number 81p. Current market price: $0.90 (foil $2.50), TCGplayer market prices via Scryfall.
Defender {U}: This creature loses defender and gains "This creature can't be blocked." {2}{U}: This creature becomes blue and has base power and toughness 5/4. Activate only if this creature doesn't have defender. {4}{U}{U}: Draw three cards. Activate only if this creature is blue and only once.