This card may attack your opponent's Life Points directly. Each time this card inflicts Battle Damage to your opponent's Life Points, increase the ATK of this card by 1000 points during your next Standby Phase. The ATK increase lasts as long as this card remains face-up on the field.
A good use of this card, would be to be Mako with Umi, summon it in attack position, place 3 cards in your backrow, it doesn't really matter what, but I prefer using Wall of Disruption, Megamorph, and Mirror Mail. You attack, doing 200 direct damage because of Umi's buff, then you end your turn, your opponent will see what you are trying to do and try to stop you, attacking your weak 200 atk mucus. Thats when you spring your traps in this order, Wall of Disruption (or any other effect to lower enemy atk or raise yours), then Mirror Mail, finally Megamorph. Your 200 mucus will lose his umi buff, but whocares when you have 2x your opponents attacking monster's atk, and lower their attack at the end of the chain so their monster is dead and yolk survives. On your next turn, enjoy your +1000atk from yolk's effect. Attack once more and most likely win.