Convex Knight

If a Machine monster is on the field and this card is in your hand: You can Special Summon this card in Defense Position, then you can make its Level become equal to the Level/Rank of 1 Machine monster on the field. During your Main Phase: You can send 1 EARTH Machine monster from your Deck to the GY, then this card gains ATK equal to the sent monster's Level x 100 until the end of this turn. You can only use each effect of "Convex Knight" once per turn.