If this card is in your hand: You can banish Machine Link Monsters from your Extra Deck whose combined Link Ratings equal exactly 5; Special Summon this card. You can target 1 card you control and 1 card your opponent controls; return them to the hand. This is a Quick Effect if this card is linked to a Link-3 or higher Machine Link Monster. You can only use each effect of "Rustin Mammoth" once per turn.