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Treeborn Frog X WATER Level 1 [ Aqua / Effect ] ATK 100 DEF 100 Once per turn, during your Standby Phase, if this card is in your GY and you do not control "Treeborn Frog": You can Special Summon this card

It gets to do this on attack, too, which means Kefka is a great value engine over time

WPN (June 4, 2020)

Ten or more nets you ten life, and twenty or more lets you win the game

Instead, I want to finish my water deck

A prime example of this is Vennominaga the Deity of Poisonous Snakes, which is extremely difficult to get on the field but is virtually impregnable if it is, unless the opponent has a Kaiju on hand