There are so many different attacks that are ideal to copy, like Radiant Greninjas [Astral Radiance] Moonlight Shuriken to snipe a few of your opponent's Pokmon, or even Charizard exs [Obsidian Flames] Burning Darkness for a late game 330 damage response
With Gleeful Demolition joining the fray going all-in on an artifact build of 8 Whack with things like Memnite and Ornithopter to sacrifice could make sense
Its quite easy to turn on, gives a big advantage to decks like Affinity by producing colored mana of any type, and works particularly well with Urzas Saga
Also, other tapped creatures you control have deathtouch, and other untapped creatures you control have hexproof
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This number of cards remained constant until the Diamond & Pearl collection when 10-card Booster Packs were introduced