It was banned just days after it was printed, after all, thanks to its ability to counter your own spell and spin into something like Emrakul or Ulamog for free, usually on Turn 1 or 2
Nine out of the ten were creatures (the last being a sorcery), but other than the link of their mana costs, the designs were varied
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Beast Whisperer isn't even tied to any particular guild, so it can fit into Gruul, Simic, Selesnya, and Golgari decks alike
So build a huge token army and use it to clear the board of any other creatures
This often has the effect of totally negating one or more players involvement in a game and creates unnecessary social friction