Hi,

I opened my first deck yesterday and I couldn't properly understand one of the card : 209-Brainstem Antenna.

Can someone explain how it works?

Thanks.

Brain Stem Antenna: This creature gains, "After you play a Mars creature, ready this creature and for the remainder of the turn it belongs to house Mars."

So basically, you attach this upgrade to a creature (probably non-Mars). Then, if you later play a Mars creature, the creature you upgraded is readied and can be used (reap, fight, or action) as a Mars creature this turn.

So an example use might be:
1) Play Brainstem on Dew Fairie (Reap: Gain 1 Æmber)
2) Play a Mars creature. This readies Dew Fairie (who was already ready)
3) Reap with Dew Fairie (since it is in the Mars house) and gain 2 Æmber (one for the reap, one for the Reap: effect). Dew Fairie exhausts.
HERE IS WHERE IT GETS GOOD.
4) Play another Mars creature. This readies Dew Fairie.
5) Reap with Dew Fairie for 2 Æmber again. Dew Fairie exhausts.

Repeat as often as you can or until you hit Rule of Six.

You could also use it for lots of fighting, or whatever.