Mage Slayer doesn't mess around
Beginner Notes (read this before you buy) Singer vs
The card is structurally compromised and does not lie flat
By using cards such as Grave Pact, Ashnods Altar, and Butcher of Malakir you should be able to keep most of your opponents from being able to maintain a board state
This does not apply to the first turn of the first player, who does not draw, which slightly compensates for the first-player advantage
For example, if the top two cards of your library are Brainstorm and the modal double-faced card Valki, God of Lies // Tibalt, Cosmic Imposter, you will end up with a modal double-faced card that has Brainstorm as one of its faces, and either Valki, God of Lies or Tibalt, Cosmic Imposter as the other face, with either face as the front (your choice)