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Just by being around, it can reduce the activated abilities cost by 1, and that can go up with equipment and anthem effect

Machina Irradiator can also destroy one of your Machines to Special Summon a Machina with a different name and an equal or lower Level than your monster, but from your Graveyard instead

For example, if you put Necrodominance onto the battlefield and then put Spellbook (an artifact that says you have no maximum hand size) onto the battlefield, you would have no maximum hand size

For example, a creature that's put into a graveyard and then ceases to exist still triggers "Whenever a creature dies" abilities