Sneak Attack and Tradewind Rider on the battlefield.
Creatures you control can tap to produce at least ({1} magic symbol) ({R} magic symbol) .
You control at least one additional creature.
Tradewind Rider does not have summoning sickness.
Steps
Activate all mana producing creatures you control by tapping them, adding at least ({1} magic symbol) ({R} magic symbol) .
Activate Sneak Attack by paying ({R} magic symbol) , putting Great Oak Guardian from your hand onto the battlefield.
Great Oak Guardian enters the battlefield, untapping all creatures you control and giving them +2/+2 until end of turn.
Activate Tradewind Rider by tapping it, Great Oak Guardian, and one other creature you control, returning Great Oak Guardian from the battlefield to your hand.