Whenever one or more cards leave your graveyard, you may create a 1/1 black and green Insect creature token, then put a number of +1/+1 counters on it equal to the greatest mana value among those cards. Do this only once each turn.
Amzu turns graveyard recursion and exile into board presence: every turn one or more cards leave your graveyard, you spawn a beefy evasive Insect. You self-mill or fill the yard, then trigger leaves-graveyard effects (flashback, escape, reanimation, delve, retrace) to drop a token sized to your biggest card, swinging with a menace-and-flying swarm.
Generates a free evasive body every turn just by playing a graveyard-centric value game
Menace anthem plus Amzu's own flying/menace make the swarm very hard to block profitably
Synergizes with strategies you'd run anyway in Golgari—recursion, sacrifice, and self-mill all naturally trigger it
Token can be enormous since counters scale to the greatest mana value leaving the yard
Rewards 'flexible' cards (escape, flashback, jump-start) by giving a second payoff
Trigger is capped to once per turn, so it won't snowball as fast as it looks
Heavily reliant on having a stocked graveyard—graveyard hate (Rest in Peace, Bojuka Bog) shuts off the engine
Five mana and somewhat fragile for a creature you must keep recasting
Tokens are 1/1 base; without big-MV fuel the bodies stay small
No built-in card advantage or ramp—you must supply the recursion engine yourself
Legendary Creature — Insect Shaman
