CardName: Blacklist
Cost: ub
Type: Instant
Pow/Tgh: /
Rules Text: Choose target spell. Its controller reveals their hand. If a
card with the same name as the spell is revealed this way,
counter that spell.
Flavour Text:
Set/Rarity: Multiverse Design Challenge Common
Blacklist
C
Instant
Choose target spell. Its controller reveals their hand. If a card with the same name as the spell is revealed this way, counter that spell.
For Challenge 100. Set is Sienira's Facets.
Since Blue/black is about war of information. You get a conditional counter that forces opponent to reveal their hand.