Monologue Tax

Whenever an opponent casts their second spell each turn, you create a Treasure token.

Damning Verdict

Destroy all creatures with no counters on them.

Oona's Blackguard

Flying
Each other Rogue creature you control enters with an additional +1/+1 counter on it.
Whenever a creature you control with a +1/+1 counter on it deals combat damage to a player, that player discards a card.

Ethersworn Canonist

Each player who has cast a nonartifact spell this turn can't cast additional nonartifact spells.