Its particularly effective in midrange shells where extra mana and repeatable value swings can decide the late game
What usually happens in a multiplayer Commander game is that everyone will start-off paying the cost, but when one person breaks, they all will, and then youll be buried under your own cards
You want to have a more expensive card there, like [cardReshape the Earth[/card] or Sifter Wurm
Creatures (5) Lands (19) Spells (36) 3 Disrupting Shoal 4 Blazing Shoal 4 Peer Through Depths 4 Dragonstorm 4 Muddle the Mixture 1 Snapback 1 Pact of Negation 1 Summoner's Pact 4 Ponder 4 Spell Pierce 4 Preordain 2 Gitaxian Probe Sideboard In Legacy, Preordain has mostly been overshadowed by Ponder and Brainstorm, but in Vintage, where those two are restricted, Preordain is king
Then, you may play 1 level 4 or lower purple Digimon card from your trash without paying the cost