Welcome to the Sandbox
You have full use of the deck editor! However, as long as you remain in sandbox mode, you will be unable to save your changes.
To save this as a new deck,
Choose your preferred layout. You can change this at any time using the Deck filters / View as options above.
At the beginning of your end step, each player exiles the top card of their library. Until your next end step, each player may play the card they exiled this way. Whenever a player plays a land from exile or casts a spell from exile, you put a +1/+1 counter on target creature and create a Food token. (It's an artifact with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")