Instant
Innistrad: Crimson Vow
56/100
Gains value in 2HG: cheap interaction.
Turns are shared and fast in 2HG. One- and two-mana answers let you hold up interaction without losing tempo.
Ratings start at a neutral 50 and are adjusted by rules derived from 2HG's structure — shared 60 life, shared turns, two opponents. They'll be recalibrated against real play rates once teams start submitting decklists.
Cleave 
(You may cast this spell for its cleave cost. If you do, remove the words in square brackets.)
Counter target spell [that wasn't cast from its owner's hand].