Stone-Seeder Hierophant does not have summoning sickness.
You control at least five other creatures.
Steps
Activate Gaea's Cradle by tapping it, adding at least eight ({G} magic symbol) .
Activate Temur Sabertooth by paying ({1} magic symbol) ({G} magic symbol) , returning Great Oak Guardian to your hand.
Cast Great Oak Guardian by paying ({5} magic symbol) ({G} magic symbol) .
When Great Oak Guardian enters, it triggers itself, untapping all creatures you control and giving them +2/+2 until end of turn.
Activate Stone-Seeder Hierophant by tapping it, untapping Gaea's Cradle.
Repeat.
If you control nine or more creatures, this combo will net infinite green mana, which you then may activate Temur Sabertooth any number of times and recast any creatures castable with green mana any number of times, effectively "blinking" your green creatures any number of times.
You may also activate Stone-Seeder Hierophant any number of times.
Results
Infinite blinking of green creatures.
Infinite ETB.
Infinite green mana.
Infinite LTB.
Infinite storm count.
Infinite untap of creatures you control.
Infinite mana creatures you control can produce.
Infinitely large creatures until end of turn.
Infinite untap of lands you control.
Infinite mana lands you control can produce.
Infinitely large creatures you control until end of turn.