Pay three generic, tap, exile Plaza of Heroes: Target legendary creature gains hexproof and indestructible until end of turn
Its enters trigger lets you reveal the top 10 cards of your library and grab one card of each color pair, which can easily refill your hand with removal, utility, and threats
But in a format like Legacy that's all about playing efficient threats and answers, it turns out that countering a one-drop for free is really goodso good that soon after the card was released, pretty much all blue decks were playing the card
LOST Power: Now into the counter trap, its pretty good, though Im not completely brushed up on my YuGiOh terminology, does the Flip effect activate after the chain resolves
(And Mega Evolutions without pre-evolutions are simply Basic Pokemon, like Mega Kangaskhan ex.) To make up for neglecting their regular forms, the Mega cards have a special note that says they're the Mega-Evolved forms