You put the -1/-1 counter on Devoted Druid as a cost to activate its ability, not when it resolves
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Be cautious using this against a Creature with Trample as youll only get counters equal to your Creatures toughness (since the rest of the damage goes to the player instead)
It lets you cast creatures directly from the graveyard by exiling other cards, making it perfect with self-mill spells like Grisly Salvage or Satyr Wayfinder
In this case, what is the best solution
This card, Flicker of Fate, would be beneficial in a White-based control or flicker deck that focuses on manipulating creatures and enchantments for strategic advantage