Predaplant Lilizard

If you control a "Predaplant" or "Starving Venom" monster and this card is in your hand: You can Special Summon this card, then you can add 1 "Polymerization" from your Deck to your hand. You can target 1 face-up monster on the field; it becomes DARK until the end of this turn. If this card is Special Summoned from the GY: You can draw 1 card. You can only use each effect of "Predaplant Lilizard" once per turn.