A few more green sacrifice options other than
Food Chain/
Birthing Pod shenanigans.
Hungry-Hungry Pitcher-Plant
2{G}
Creature - Plant (R)
When Hungry-Hungry Pitcher-Plant enters the battlefield, you may search your library for a basic land card, reveal it, put it into your hand, then shuffle.
{G}, T, Sacrifice another creature: Search your library for a Forest card, reveal it, put it into your hand, then shuffle.
1/2
The lushest gardens are also the hungriest.
Juvenile Twig Mantis
1{G}
Creature - Insect (C)
3{G}{G}, Sacrifice another creature: Adapt X, where X is the toughness of the sacrificed creature.
2/2