To exploit those strategies, you need to fill your graveyard, and Golgari Grave-Troll is one of the best ways to do so
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In general, you Past in Flames is at its best against counterspells because of Flashback, and good for longer games where Ad Nauseam and Empty the Warrens are no longer good enough, but your graveyard is stocked with good spells to flashback
In total, there are 13 cards that use the mechanic
W/U fliers, W/U control, W/U aggro, W/U theme decks, mixing and matching for some classic stuff like Bant control or Jeskai aggro
Silver Rayleighs immediate board impact makes him ideal for Red strategies needing decisive plays