This is the Primordial Hunger deck from Planechase.

Your little creatures at the start of the game become snacks for the huge monsters that come later, making them even bigger and scarier. And the moment your opponent thinks you're going to beat him with a swarm of creatures, your even bigger creature comes!

Planechase is a Magic: the Gathering game variant where you make a journey with your opponents over the different Planes (worlds) of the Magic Multiverse. Every Plane has unique characteristics that influence the game situation. In this new Planechase edition, you will also encounter Phenomena (events) during your journey across the Planes that could influence the game. With Planechase you travel along the Planes and face nice surprises. Each Planechase deck contains 60 black-bordered cards, including 6 brand-new, never-before-released cards. All new cards are tournament legal in Vintage and Legacy. A Planechase deck includes: - a deck 60 of blackbordered cards, of which 6 are unreleased cards - A deck of 10 oversized Planar cards (Planes and Phenomena) - A Planar die

Note: the description is machine translated and might contain errors.