Advanced format ruling
Machina Armored Unit
Card effect (current official text)Once per turn, when a Machine monster is destroyed by battle and sent to your GY: You can Special Summon 1 Machine monster from your Deck that has the same Attribute and less ATK than that destroyed monster in the GY.
Current rulings for this card are maintained by Konami.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Advanced forum — sourced change requests get reviewed.