Trislum, the Oppositioner

Menace
Aura spells you cast that target a player cost {1} less to cast for each creature that player
controls that is in a party.
Whenever an opponent is the target of a spell,
they may discard a card, pay {2} and lose 3 life.
If they do, they choose a new target for the spell.
You gain 3 life and draw a card.