Alongside the standard mechanic that restricts players from opening packs or Wonder Picking or, now, trading too much without spending real world money, the feature was also introduced with an extra restriction called Trade Tokens
The Treasure is already good enough (where you at, Academy Manufactor?), and the exiled card super sweet
He loots away unused cards while bouncing threats, accruing value each turn
Staples Kiki-Jiki, Mirror-Breaker Recoup This ones pretty contextual, but its hard to imagine a deck that cant take significant advantage of it
One is that it is just -3/-3 making it a fairly soft mass removal effect
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