Gravemind, Flood Overlord

Flood Infestation-Whenever a creature you control
dies, create a 1/1 black and green Flood Spore
creature token with "At the beginning of your
upkeep, you may sacrifice this creature. If you do,
create a 2/2 black and green Flood Carrier creature
token with 'When this creature dies, create two 1/1
black and green Flood Spore creature tokens.'"

Eldritch Regeneration-Whenever a Flood creature
token you control dies, you may pay 1 life. If you do,
draw a card.