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Rulings
Once Mishra's Factory is an Assembly-Worker, it is a legal target for its last ability. For example, you could animate Mishra's Factory, block with it, then activate it last ability to make it 3/3.
If Mishra's Factory becomes a creature and you haven't controlled it continuously since the beginning of your most recent turn, you won't be able to activate its first or last abilities, and it won't be able to attack (unless something is giving it haste).
If Mishra's Factory is already a creature, activating the second ability will override any previous effects that set its power and/or toughness to specific values. Other effects that are affecting its power and/or toughness, including +1/+1 counters and the effects of spells like Giant Growth, will continue to apply.
If Mishra's Factory becomes a creature and you haven't controlled it continuously since the beginning of your most recent turn, you won't be able to activate its first or last abilities, and it won't be able to attack (unless something is giving it haste).
If Mishra's Factory is already a creature, activating the second ability will override any previous effects that set its power and/or toughness to specific values. Other effects that are affecting its power and/or toughness, including +1/+1 counters and the effects of spells like Giant Growth, will continue to apply.
Rulings
Once Mishra's Factory is an Assembly-Worker, it is a legal target for its last ability. For example, you could animate Mishra's Factory, block with it, then activate it last ability to make it 3/3.
If Mishra's Factory becomes a creature and you haven't controlled it continuously since the beginning of your most recent turn, you won't be able to activate its first or last abilities, and it won't be able to attack (unless something is giving it haste).
If Mishra's Factory is already a creature, activating the second ability will override any previous effects that set its power and/or toughness to specific values. Other effects that are affecting its power and/or toughness, including +1/+1 counters and the effects of spells like Giant Growth, will continue to apply.
If Mishra's Factory becomes a creature and you haven't controlled it continuously since the beginning of your most recent turn, you won't be able to activate its first or last abilities, and it won't be able to attack (unless something is giving it haste).
If Mishra's Factory is already a creature, activating the second ability will override any previous effects that set its power and/or toughness to specific values. Other effects that are affecting its power and/or toughness, including +1/+1 counters and the effects of spells like Giant Growth, will continue to apply.
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