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When you do, target creature gets -1/-1 until end of turn

One popular control payoff card is Approach of the Second Sun

Well, once per card type

It's very powerful in a deck that cares, and you can grow your battlefield over time from a 3-drop Reclamation Sage to a Timeless Witness then an Acidic Slime then a game-winning Carnage Tyrant

Spending five mana to give each player the option of a draw-seven at sorcery speed means that your opponent will get the first crack at actually casting the cards, but spending six mana for the opportunity to leverage the cards drawn first is much more powerful if you can afford to take a turn off