Gimble, Venture Capitalist

Whenever an opponent attacks you, draws an
additional card on their turn, searches their
library for a card, plays a second land on their
turn, or taps an artifact or creature for mana,
create a treasure token.
When a creature your opponent controls
attacks you, you may sacrifice a number of
treasure tokens equal to that creature's power.
If you do, that creature attacks target
opponent instead.