Apollo

 is a legendary unit  with an unique sniping ability, allowing it to ignore blockers and destroy one unit with 3 or less health unit per turn.

Strategy
Apollo is an extremely potent unit, being able to instantly destroy any enemy unit with Health or less. Its sniping ability is balanced by a high cost (in both gold and blue tech), the inability to attack, the lack of block and a 2-turn construction. Its ability can be used to destroy enemy Blockers in order to breach, destroy enemy attacking units in order to prevent damage and even destroy tech-producing units such as Blastforge, disrupting your opponent's production. While using it for destroying Blockers is OK if it deals 3 Attack, its strongest value comes from destroying Attackers when already under some pressure. Destroying one saves 1 point of Defense immediately, thus over 2 gold, and forever, which is as having paid 6 gold for permanent 1 Defense production. The defense for the snipe Threat is also left idle, which is worth about 2 Drones.

Apollo is best bought in random sets containing blue units that are able to deny Absorb (Manticore, Oxide Mixer) or overcome it quickly (Drake) to bypass losing value from being behind on attack against the absorb. It has a weakness to other high-tech blue units able to prevent the Apollo from having Walls or Attackers to snipe, such as Omega Splitter or Energy Matrix.

Apollo is not as useful against enemies relying heavily on high-Health units, or against opponents relying heavily on low-cost units and units that are already easy to destroy (such as units with Frontline or Lifespan). As a rule, before committing to Apollo, players should always search the random set for units that can be sniped, and which of those the other player is likely to use. If Cynestra, Tatsu Nullifier, or Lucina Spinos are in the set, for example, Apollo is probably something to get, or at least leave yourself the option of getting until you're sure the opponent isn't going for any of those units. It is also good in sets without very efficient Attackers, as replacing them is harder for the opponent.

A useful trick to know is that Fragile units with or more can be damaged through other means, then destroyed by Apollo during the same turn by first inflicting them with damage to bring them to 3 health and then clicking them with Apollo.

Countering Apollo
If you think your opponent is going to build an Apollo, building Conduits can be a smart play. Units produced using the green resource tend to have high health, putting them out of Apollo's sniping range such as Gauss Cannon. Additionally, Conduits are relatively cheap, they are easy to replace if your opponent snipes them. Red and Green only defense can prevent the Apollo denying Wall absorb and 3-Attack value, as well as dodging the Threat if it snipes Attack instead (RRFE defense and Ts vs 4 Attack). Getting a big economy and building high health blue attackers like Drake and Omega Splitter or even getting your own Apollo can be a valid strategy.

Openings
Player 1
 * DD
 * 1) DDE
 * 2) DDD
 * 3) DDDB
 * 4) BBS
 * 5) Apollo +D

Player 2
 * DD
 * 1) DDE
 * 2) DDD
 * 3) BBBD
 * 4) Apollo

Player 1 Synthesizer (1) rush.
 * DD
 * DD
 * 1) DDB
 * 2) DC1
 * 3) Apollo

Change log

 * December 17th, 2014
 * Supply decreased from 4 to 1.
 * Buildtime increased from 1 turn (default) to 2 turns.
 * Cost decreased from 17 to 13.
 * November 1st, 2014
 * Cost increased from 15 to 17.
 * October 4th, 2014
 * Added.