While his ability does not serve to add cards to graveyards, many Rogues do, and, for that reason he is a big staple in Rogue Commander decks
Add Intrepid Adversary, Luminarch Aspirant, and The Wandering Emperor to grow your army and Legion Angel as a top-end flyer, and you have a pretty solid game plan already
Brawl Legal Vintage Legal Timeless Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Buy This Card Notes and Rules Information for Fynn, the Fangbearer: Losing the game because a player (preferably an opponent) has ten or more poison counters is a rule of the game
Enchantment Loading Zone If one or more counters would be put on a creature, Spacecraft, or Planet you control, twice that many of each of those kinds of counters are put on it instead
Hopefully this even happens several times a game, as the table correctly identifies that who is "the threat" has changed and priorities shift
Skullclamp can work in a pinch to achieve this (and if you have it)