Heroes' Podium is a rare Legendary Artifact card from Born of the Gods (BNG), collector number 159. Current market price: $0.60 (foil $4.85), TCGplayer market prices via Scryfall.
Each legendary creature you control gets +1/+1 for each other legendary creature you control. {X}, {T}: Look at the top X cards of your library. You may reveal a legendary creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.