card size mtg Rules Text: maximum, hand, size, reduced, 7 cards The Gathering Rodents of Unusual Size -

When you spend this mana to cast an instant or sorcery spell with mana value 3 or less, you may exile that spell instead of putting it into its owner's graveyard as it resolves

The flexibility of exiling key permanents such as Amulet of Vigor or Aether Vial is extremely relevant in a format as diverse as Modern, and many decks are even opting to splash an additional color by adding off-color Shocklands or Tri-color (Triomes) lands to their mana base, so they pay an additional color for the converge mechanic on Prismatic Ending

1 Void Rend

Whether you have a powered up Nykthos, Shrine to Nyx or a twice-enchanted Forest to untap, Treachery lets you grab the best creature at the table, often with a positive mana advantage