Lavinia, Azorius Renegade

Each opponent can't cast noncreature spells with converted mana cost greater than the number of lands that player controls.
Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
Card Type Breakdown
Artifact
15 cards
Creature
14 cards
Instant
16 cards
Enchantment
11 cards
Planeswalker
3 cards
Land
32 cards
Sorcery
8 cards