Steyr

 is a Tier 5 Tank that upgrades from Stalker and Nailgun at level 60.

Technical
The can switch between a Stalker and a Nailgun form. It can go invisible as both forms, although its invisibility is removed for a small bit when it switches barrels.

Trivia

 * This tank was an idea by Knightmare.
 * This is the only Animated Tank that is also an Invisible Tank.