The Mouse Pokmon is here as a foil promo card that can help you find an Item card in your deck, and it's joined by another Pokmon friend as a playable foil card
(Reminder text is any italicized text in parentheses that explains rules you already know.) Can Duh destroy a creature if another version of it exists with reminder text
What puts it behind other ramp cards is that it can only search for basic Forests, so its less useful for mana fixing
Regardless of where you fall on when you think lying is worth it, I think its strategically optimal to avoid in low stakes situations, so Id generally recommend refusing to answer a request for information about your upcoming actions rather than lying about them
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With the Poison status, Mega Venusaur effectively does 130 DMG, and if you happen to have two Nihilego on your Bench, you take out 20 more HP, leading to 150 DMG (with the poisoned opponent losing -30 HP every turn unless they retreat or heal)