"Masters 25", Assembly-Worker (3)
: Target Assembly-Worker creature gets +1/+1 until end of turn.
: Add .
: Mishra's Factory becomes a 2/2 Assembly-Worker artifact creature until end of turn. It's still a land.
When Self-Assembler enters, you may search your library for an Assembly-Worker creature card, reveal it, put it into your hand, then shuffle.
Gatherer works better in the Companion app!