Jax, Mechanical Mastermind

Other artifact creatures you control get +0/+2.

Whenever a Mech you control switches its power and toughness, that creature gains +X/+X until end of turn, where X is its toughness minus its power before switching.

{2}{w}{t}: Target Mech you control gains indestructible until end of turn.

“Every bolt tightened, every panel reinforced—my machines will endure.”