You need to continue to think this through.
If taxes are a deflationary mechanism because they remove money from circulation, then that would imply that the opposite is also true; that putting too much money into circulation is, broadly, an inflationary mechanism.
There's a lot of nuance I'm skipping over there, but that's exactly my point. You're taking a very basic, very one dimensional view of MMT and treating it as a license to spend infinite money, when that's not actually what the theory says at all.