Each time a Rock-Type monster is Normal Summoned, gain 500 LP. If a "Triamid" monster is Normal Summoned: You can draw 1 card, then discard 1 card. If this face-up card in the Field Zone is sent to the Graveyard: You can add 1 "Triamid" monster from your Deck to your hand. You can only use this effect of "Triamid Cruiser" once per turn.