Random Card of the Day #119:
Polymorph - 3U
Destroy target creature. It can't be regenerated. Its controller reveals cards from the top of his or her library until he or she reveals a creature card. The player puts that card onto the battlefield, then shuffles all other cards revealed this way into his or her library.
Such as a classic card. For me at least. I didn't personally use Polymorph, but I had used my friend's Mass Polymorph deck. I like Mass Polymorph a lot better though.
Yes, I know it costs a lot more than Polymorph, but one of the "huge" drawbacks of Polymorph was being responded to. It's sorcery speed and targets only one creature, so if your opponent has instant speed removal, he can Doom Blade your creature in response and then Polymorph is countered due to lack of targets.
Mass Polymorph functions as a blanket effect, so it will resolve as long as it's not Counterspell'd. Instant speed removal is still effective against this, however there are very few instant speed Wrath effects. Red actually has quite a few if you wanted to go as far as Modern, but outside of card like Rout there aren't very many AoE clears. I suppose your opponent could have enough single-target spells to clear your creatures, but that's a bit a of a swing in card advantage just to kill tokens.
And yes, I assume you only play tokens in this deck. At least it would make a lot of sense. Key cards played could be Khalani Garden, Beastial Menace, or maybe even Mind Control. Still a great card--but like all great cards, it can be responded to. 4/5