Interplanar Tunnel is a common Phenomenon card from Planechase 2012 Planes (OPC2), collector number 2. Current market price: $7.48, TCGplayer market prices via Scryfall.
When you encounter Interplanar Tunnel, reveal cards from the top of your planar deck until you reveal five plane cards. Put a plane card from among them on top of your planar deck, then put the rest of the revealed cards on the bottom in a random order. (Then planeswalk away from this phenomenon.)