Chimil, the Inner Sun is a mythic Legendary Artifact card from The Lost Caverns of Ixalan (LCI), collector number 249. Current market price: $9.39 (foil $14.40), TCGplayer market prices via Scryfall.
Spells you control can't be countered. At the beginning of your end step, discover 5. (Exile cards from the top of your library until you exile a nonland card with mana value 5 or less. Cast it without paying its mana cost or put it into your hand. Put the rest on the bottom in a random order.)