Hogaak, Arisen Necropolis + Korozda Guildmage + Phyrexian Altar

Hogaak, Arisen Necropolis

Korozda Guildmage

Phyrexian Altar

How it works

1. Activate Korozda Guildmage's second ability by paying 2 and sacrificing Hogaak.
2. If Hogaak is your commander, choose not to return it to the command zone from your graveyard.
3. Resolve the Korozda Guildmage trigger, creating eight 1/1 Saproling creature tokens.
4. Cast Hogaak from your graveyard by tapping seven Saprolings.
5. Activate Phyrexian Altar four times by sacrificing four Saprolings, adding 2.
6. Repeat.

This engine turns a massive creature into an endless cycle of rebirth by leveraging Hogaak, Arisen Necropolis's ability to be cast straight from the graveyard using convoke and delve. You feed Hogaak to Korozda Guildmage's second ability, converting its huge toughness into an army of Saproling tokens. Those very tokens provide the mana-free casting bodies required to recast Hogaak using convoke, while Phyrexian Altar steps in to sacrifice the leftover Saprolings to generate the exact black and green mana needed to activate the Guildmage all over again.