Jupiter Drone
Jupiter Drone is a rare Isaac card.
Description
Costs 1 energy. When played:
- 1. Launch a Jupiter Drone.
Exhausts when played.
Upgrades
Jupiter Drone A
Costs 0 energy. When played:
- 1. Launch a Jupiter Drone.
Exhausts when played.
Jupiter Drone B
Costs 1 energy. When played:
- 1. Launch a Jupiter Drone with a Bubble Shield.
Exhausts when played.
Clarification
Jupiter Drones function as extra cannons for the player. They fire after the player's ship's cannon(s) (if any) fire for any reason, and from left to right.
They copy all lines on cards played that have 
on them, and anything to their right (the effects "caused" by the shot directly). They do not copy anything else on the card. For example, if you play Stun Shot, your Jupiter Drones will also stun with their attacks. If you play Block Shot, the Jupiter drones will copy the attack but not the Shield gain. If you play Lunge, your Jupiter Drones will fire after you shift and attack, but they will not themselves shift, only attack.
Jupiter Drones do not do anything during the Drone Turn and are unaffected by Radio Control.
Strategy
Jupiter Drones are a great damage multiplier, allowing you to deal twice as much damage if you line it up with the enemy ship along with your cannons. While they can serve defensively like any other midrow object, Jupiter Drones more than other midrow object really appreciate living long enough to kill the enemy. Droneshift and Evade are useful for both this and for lining up all of your cannons on the enemy ship for best results. Alternately, they can be launched right before a killer blow, such as From Hell's Heart or Parry so that they don't take long to make their presence felt.
Its A upgrade makes it cost 1 less, helping you burst with it more, for example letting you play both it and From Hell's Heart or Parry on the same turn.
Its B upgrade on the other hand gives it better longevity and defensive utility by allowing it to take one hit without dying.
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