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Once the last time counter is removed, it becomes a creature

A number of skilled Storm players have tried to leverage the sideboard to incorporate cards like Pieces of the Puzzle to power through one-for-one disruption, but I suspect that Fact or Fiction and a giant pile of Lightning Bolts and Grim Lavamancers could do the job

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If you have enough Rat tokens on the battlefield and a board wipe happens, it's possible that Mirkwood Bats can burn all of your opponents out of the game

Theres also some small overlap between self-mill and counters decks, as seen with Amzu, Swarm's Hunger or Centaur Vinecrasher, so I imagine quite a few decks are happy to host Obsessive Skinner