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Deathtouch
Whenever a creature you control with deathtouch deals combat damage to a player, that player gets two poison counters. (A player with ten or more poison counters loses the game.)
Losing the game because a player (preferably an opponent) has ten or more poison counters is a rule of the game. Fynn doesn't have to still be on the battlefield when someone (preferably an opponent) gets their tenth poison counter.
