Chimil, the Inner Sun [The Lost Caverns of Ixalan Prerelease Cards]

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.)