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
Vampire Charmseeker with haste.
When the
Vampire Charmseeker tokens enter, they trigger, returning
Mana Geyser and
Devastating Onslaught from your graveyard to your hand.