Its about 75% committed to being an otter deck (why are there three copies of Waterspout Warden here?), and the rares arent half-bad, with the exclusive Bria, Riptide Rogue being an actual house of a card
For a long time, Karn has been used as a shutdown piece to prevent your opponent from generating mana, often alongside Mycosynth Lattice
If you cast a spell for another cost "rather than pay its mana cost," you can't choose to cast it for any alternative costs
At the beginning of combat on your turn, each opponent faces a villainous choice That player sacrifices a creature they control, or you create a 3/3 black Dalek artifact creature token with menace
Opponent poisoned
When that spell or ability resolves, Hullbreaker Horror won't be countered, but any additional effects of the countering spell or ability will still happen