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Add in things like variants of cards, and this gets very complicated to communicate and understand

Worldwake (2010) brought Card not found, which requires an Island, so its basically half blue and probably pretty playable in Limited, although not having played that specific format, I cant be sure

They mutate into the creature on top plus all abilities from under it.) Menace (This creature cant be blocked except by two or more creatures.) Whenever this creature mutates, each opponent discards a card

That would be Skullclamp

While this card may appear inherently defensive, able to make creatures more defensive during an opponent's attack, wall decks can often use this card offensively