Simple Version:
Step 1. You play Frogs.
Step 2. You play Polymorphist's Jest to make all your opponent's creatures frogs
Step 3. You play Peer Pressure stealing all of their frogs.
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More Detailed Version:
Step 1. You play Frogs = Memnite, Ornithopter, and Spore Frog. All early game drops. Spore Frog provides combat damage protection. And, believe it or not, the Memnite and Ornithopter will be Frogs, soon enough. Mutavault can easily be a frog.
Step 2. You play Polymorphist's Jest to make all of your opponent's creatures frogs. To help make Polymorphist's job easier, Rapid Hybridization, Omnibian, and Amoeboid Changeling also makes sure opponent creatures are turned into frogs.
Step 3. You play Peer Pressure stealing all of their frogs. With Peer Pressure, if i control more frogs than my opponent, any frogs he has in his control, I get to steal...so, to make sure he actually has creatures I have Forbidden Orchard and Beast Within.
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It is give and take, with this deck. Here is what to remember:
A) Make sure they have creatures to steal (Forbidden Orchard and Beast Within).
B) Make sure I always have more creatures than my opponent (memnite, ornithopter, spore frog, and temporal spring).
C) Use my cards that change creature types to ensure that more of my creatures are frogs, and less of my opponent's creatures are frogs. (amoeboid changeling/dream's grip combo, omnibian/memnite and ornithopter combo, and multvault can instantly become a frog).
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Breakdown of cards:
Memnite and Ornithopter = Fast, free creatures that can be turned into Frogs
Amoeboid Changeling/Dream's Grip = Combo has 2 Purposes: 1. Key to ensure that I have more Frogs 2. PLUS ensuring their creatures also count as Frogs.
Frantic Search = Search and draw engine. Hopefully will get me my Peer Pressure.
Omnibian = Several purposes: 1) Helps turn my Ornithopter/Memnite into Frogs. 2) Helps with pumping up my creatures, helping out with chump blocking/attacking. 3) Helps turn my opponent's creatures into Frogs, so that I can steal them with Peer Pressure.
Spore Frog = Not only does it up my Frog count, it is also a first turn drop, and great at providing combat damage prevention. It can save your life.
Beast Within = 3 purposes: 1) Acts as Artifact/Enchantment/Land hate. 2) Removes deadly creatures that my opponent may have. 3) Helps make sure my opponent has creatures that I can turn into Frogs.
Biomass Mutation = Once I have my Frog army, it is time to pump them up, and attack :)
Rapid Hybridization = 3 purposes also: 1) Acts as a safeguard, destroying any dangerous creature my opponent has. 2) Makes sure my opponent has Frogs to steal with Peer Pressure. 3) Can nuke my weak Ornithopters/Memnites and turn them into 3/3 Frogs, ensuring I have more Frogs then my opponent does.
Peer Pressure = My win condition. If I control more Frogs than my opponent, I get to steal all of my opponent's creatures, leaving them defenseless. It is what gives me my Frog Army.
Temporal Spring = 2 puposes: 1) Acts as great artifact/enchantment hate. 2) Makes sure my opponent does not have more creatures that I do, that way Peer Pressure will actually connect.
Forbidden Orchard = 2 purposes: 1) Gives me great mana versatility. 2) Makes sure my opponent has creatures to be able to steal.
Mutavault = Also has 2 purposes: 1) Acts as instant chump blocking/attacking. 2) Helps ensure that I have more Frogs than my opponent does.