Since noone mentioned it yet: It's pretty easy to go infinite with Staff of Domination and a Priest of Titania on the table, a lot of (some, at least

) people play this combo in Legacy... works better than clamping and producing mana for an eternity only to drop some more elves.
Also, Sword of Paruns is fun too.
If you don't go infinite, it protects from Pyroclasm, Engineered Plague, and makes some serious damage.
You could always play Natural Order too, if you ever get bored
(Or need if you need a cool sideboard plan against other aggro decks).
I think there are better things than Food Chain in Elves.
Elves can produce so much mana, I don't why you would need Food Chain.
It also forces you to build around a weak combo card.
If you intent on using it, why not play some fatter creatures?
Patron of the Orochi? Verdant Force? Protean Hulk? Karona, False God? Kiki Jiki?
Primordial Sage?
Also, a lot of the decklists in the suggestions above are filled with better elves you could use//test.
Good Luck!