Surge Engine

Defender
{u}: Surge Engine loses defender and gains
"This creature can't be blocked."
{2}{u}: Surge Engine becomes blue and has base
power and toughness 5/4. Activate only if Surge
Engine doesn't have defender.
{4}{u}{u}: Draw three cards. Activate only if
Surge Engine is blue and only once.
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"Nice work, killing machines."