I would guess the other 5, but their mechanics aren't revealed yet.
Worldsoul Flourishing
Sorcery {Mythic}
Put X 1/1 green Saproling creature tokens onto the battlefield, then populate X times.
Golgari Mortification
Sorcery {Mythic}
Target player sacrifices X creatures, then put X +1/+1 counters on target creature.
Worldsoul Flourishing
Sorcery {Mythic}
Put X 1/1 green Saproling creature tokens onto the battlefield, then populate X times.
Golgari Mortification
Sorcery {Mythic}
Target player sacrifices X creatures, then put X +1/+1 counters on target creature.