Sundial of the Infinite [Magic 2012] Common during either player's turn: You

during either player's turn: You can target 1 face-up monster on the field

its ATK becomes doubled until the end of this turn

Sacrifice another creature: Each opponent loses life equal to the sacrificed creature's power

then send 1 card from their hand to the GY

500) to have the monster it's battling lose that much ATK and DEF

Sundial of the Infinite [Magic 2012] Common during either player's turn: YouSet: Magic 2012 Type: Artifact Rarity: Rare Cost: {2} {1}, {T}: End the turn. Activate only during your turn. (Exile all spells and abilities from the stack. Discard down to your maximum hand size. Damage wears off, and "this turn" and "until end of turn" effects end.)