Mana Geyser by paying ({3} magic symbol) ({R} magic symbol) ({R} magic symbol) , adding ({R} magic symbol) for each tapped land your opponents control.
Cast
Devastating Onslaught by paying ({4} magic symbol) ({R} magic symbol) , creating two token copies of
Warden of the Eye with haste.
When the
Warden of the Eye tokens enter, they trigger, returning
Mana Geyser and
Devastating Onslaught from your graveyard to your hand.